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Oleg Mediannikov - One of the best experts on this subject based on the ideXlab platform.
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molecular detection of microorganisms in lice collected from farm animals in northeastern algeria
Comparative Immunology Microbiology and Infectious Diseases, 2020Co-Authors: Basma Ouarti, Souad Righi, Ahmed Benakhla, Oleg Mediannikov, Didier Raoult, Philippe ParolaAbstract:Abstract Lice (Phthiraptera) are highly specific insects organized into four suborders (Anoplura, amblycera, ischnocera and rhynchophthirina). Lice may affect human and animal health. Our objective was to study the bacterial community of lice collected in Algeria. Using molecular tools, we were able to identify by real time PCR the presence of Coxiella burnetii DNA in 1% (3/300) Linognathus africanus and in 0.3% (1/300) Linognathus vituli collected from goats and cattle respectively. We also detected the presence of Anaplasmataceae bacteria in Bovicola bovis, L. vituli from cattle and in L. africanus from goats. By standard PCR’s and sequencing, we were able to identify Anaplasma ovis in L. africanus as well as a novel Anaplasmataceae sp genotype corresponding probably to a new genus within this family.
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molecular investigation and phylogeny of species of the Anaplasmataceae infecting animals and ticks in senegal
Parasites & Vectors, 2019Co-Authors: Tinhinene Ameur, Mustapha Dahmani, Hubert Bassene, Masse Sambou, Pierre Scandola, Bernard Davoust, Oleg MediannikovAbstract:Our study aimed to assess the diversity of the species of Anaplasmataceae in Senegal that infect animals and ticks in three areas: near Keur Momar Sarr (northern region), Dielmo and Diop (Sine Saloum, central region of Senegal), and in Casamance (southern region of Senegal). A total of 204 ticks and 433 blood samples were collected from ruminants, horses, donkeys and dogs. Ticks were identified morphologically and by molecular characterization targeting the 12S rRNA gene. Molecular characterization of species of Anaplasmataceae infecting Senegalese ticks and animals was conducted using the 23S rRNA, 16S rRNA, rpoB and groEL genes. Ticks were identified as Rhipicephalus evertsi evertsi (84.3%), Hyalomma rufipes (8.3%), Hyalomma impeltatum (4.9%), R. bursa (1.5%) and R. muhsamae (0.9%). The overall prevalence of Anaplasmataceae infection in ticks was 0.9%, whereas 41.1% of the sampled animals were found infected by one of the species belonging to this family. We identified the pathogen Anaplasma ovis in 55.9% of sheep, A. marginale and A. centrale in 19.4% and 8.1%, respectively, of cattle, as well as a putative new species of Anaplasmataceae. Two Anaplasma species commonly infecting ruminants were identified. Anaplasma cf. platys, closely related to A. platys was identified in 19.8% of sheep, 27.7% of goats and 22.6% of cattle, whereas a putative new species, named here provisionally “Candidatus Anaplasma africae”, was identified in 3.7% of sheep, 10.3% of goats and 8.1% of cattle. Ehrlichia canis and Anaplasma platys were identified only from dogs sampled in the Keur Momar Sarr area. Ehrlichia canis was identified in 18.8% of dogs and two R. e. evertsi ticks removed from the same sheep. Anaplasma platys was identified in 15.6% of dogs. Neither of the dogs sampled from Casamance region nor the horses and donkeys sampled from Keur Momar Sarr area were found infected by an Anaplasmataceae species. This study presents a summary of Anaplasmataceae species that infect animals and ticks in three areas from the northern, central and southern regions of Senegal. To our knowledge, our findings demonstrate for the first time the presence of multiple Anaplasmataceae species that infect ticks and domestic animals in Senegal. We recorded two potentially new species commonly infecting ruminants named here provisionally as Anaplasma cf. platys and “Candidatus Anaplasma africae”. However, E. canis was the only species identified and amplified from ticks. None of the other Anaplasmataceae species identified in animals were identified in the tick species collected from animals.
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co infection of bacteria and protozoan parasites in ixodes ricinus nymphs collected in the alsace region france
Ticks and Tick-borne Diseases, 2019Co-Authors: Amira Nebbak, Handi Dahmana, Benoit Jaulhac, Lionel Almeras, Nathalie Boulanger, Oleg MediannikovAbstract:Abstract Fifty nymphal Ixodes ricinus ticks collected in Alsace, France, identified by morphological criteria and using MALDI-TOF MS, were tested by PCR to detect tick-associated bacteria and protozoan parasites. Seventy percent (35/50) of ticks contained at least one microorganism; 26% (9/35) contained two or more species. Several human pathogens were identified including Borrelia burgdorferi s.s. (4%), Borrelia afzelii (2%), Borrelia garinii (2%), Borrelia valaisiana (4%), Borrelia miyamotoi (2%), Rickettsia helvetica (6%) and “Babesia venatorum” (2%). Bartonella spp. (10%) and a Wolbachia spp. (8%) were also detected. The most common co-infections involved Anaplasmataceae with Borrelia spp. (4%), Anaplasmataceae with Bartonella spp. (6%) and Anaplasmataceae with Rickettsia spp. (6%). Co-infection involving three different groups of bacteria was seen between bacteria of the family Anaplasmataceae, Borrelia spp. and Bartonella spp. (2%). Results highlight the panel of infectious agents carried by Ixodes ricinus. Co-infection suggests the possibility of transmission of more than one pathogen to human and animals during tick blood feeding.
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Prevalence of Anaplasmataceae and Filariidae species in unowned and military dogs in New Caledonia
Veterinary Medicine and Science, 2018Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Olivier Cabre, Oleg MediannikovAbstract:Dogs are competent reservoir hosts of several zoonotic agents, including Filariidae nematodes and Anaplasmataceae family bacteria. The latter family unites human and veterinary pathogens (Anaplasma, Ehrlichia and Neorickettsia bacteria) with Wolbachia, some of which are obligatory endosymbionts of pathogenic filarial nematodes. The epidemiology of Anaplasmataceae and Filariidae species infecting dogs living in kennels in New Caledonia was studied. 64 EDTA blood samples were screened for the presence of Anaplasmataceae and filarial nematodes. Molecular study was conducted using primers and probe targeting the of 23S rRNA long fragment of Anaplasmataceae species. Next, all blood sample was screened for the presence of Filariidae species targeting the primers and probe targeting the COI gene, as well as primers targeting the COI and 5S rRNA genes of all filarial worms. Anaplasma platys was identified in 8/64 (12.5, 95% confidence interval [CI]: 4.4-20.6%) and Wolbachia endosymbiont of Dirofilaria immitis in 8/64 (12.5%, CI: 4.4-20.6%). Filariidae species investigation was performed and showed that 11/64 (17.2%, CI: 7.9-26.4%) dogs were infected with D. immitis, whereas, 2/64 (3.1%, CI: 0.0-7.3%) were infected with Acanthocheilonema reconditum. Finally, we checked the occurrence of co-infection between Anaplasmataceae and Filariidae species. Co-occurrence with Wolbachia endosymbiont of D. immitis was observed in seven dogs, one dog was co-infected with A. platys and A. reconditum and another was co-infected with Wolbachia endosymbiont of D. immitis and A. reconditum. These results are the first report of Anaplasmataceae and Filariidae occurring in dogs in New Caledonia.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites & vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Oleg MediannikovAbstract:Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, “Candidatus Anaplasma corsicanum”, “Candidatus Anaplasma mediterraneum” were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
Mustapha Dahmani - One of the best experts on this subject based on the ideXlab platform.
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molecular investigation and phylogeny of species of the Anaplasmataceae infecting animals and ticks in senegal
Parasites & Vectors, 2019Co-Authors: Tinhinene Ameur, Mustapha Dahmani, Hubert Bassene, Masse Sambou, Pierre Scandola, Bernard Davoust, Oleg MediannikovAbstract:Our study aimed to assess the diversity of the species of Anaplasmataceae in Senegal that infect animals and ticks in three areas: near Keur Momar Sarr (northern region), Dielmo and Diop (Sine Saloum, central region of Senegal), and in Casamance (southern region of Senegal). A total of 204 ticks and 433 blood samples were collected from ruminants, horses, donkeys and dogs. Ticks were identified morphologically and by molecular characterization targeting the 12S rRNA gene. Molecular characterization of species of Anaplasmataceae infecting Senegalese ticks and animals was conducted using the 23S rRNA, 16S rRNA, rpoB and groEL genes. Ticks were identified as Rhipicephalus evertsi evertsi (84.3%), Hyalomma rufipes (8.3%), Hyalomma impeltatum (4.9%), R. bursa (1.5%) and R. muhsamae (0.9%). The overall prevalence of Anaplasmataceae infection in ticks was 0.9%, whereas 41.1% of the sampled animals were found infected by one of the species belonging to this family. We identified the pathogen Anaplasma ovis in 55.9% of sheep, A. marginale and A. centrale in 19.4% and 8.1%, respectively, of cattle, as well as a putative new species of Anaplasmataceae. Two Anaplasma species commonly infecting ruminants were identified. Anaplasma cf. platys, closely related to A. platys was identified in 19.8% of sheep, 27.7% of goats and 22.6% of cattle, whereas a putative new species, named here provisionally “Candidatus Anaplasma africae”, was identified in 3.7% of sheep, 10.3% of goats and 8.1% of cattle. Ehrlichia canis and Anaplasma platys were identified only from dogs sampled in the Keur Momar Sarr area. Ehrlichia canis was identified in 18.8% of dogs and two R. e. evertsi ticks removed from the same sheep. Anaplasma platys was identified in 15.6% of dogs. Neither of the dogs sampled from Casamance region nor the horses and donkeys sampled from Keur Momar Sarr area were found infected by an Anaplasmataceae species. This study presents a summary of Anaplasmataceae species that infect animals and ticks in three areas from the northern, central and southern regions of Senegal. To our knowledge, our findings demonstrate for the first time the presence of multiple Anaplasmataceae species that infect ticks and domestic animals in Senegal. We recorded two potentially new species commonly infecting ruminants named here provisionally as Anaplasma cf. platys and “Candidatus Anaplasma africae”. However, E. canis was the only species identified and amplified from ticks. None of the other Anaplasmataceae species identified in animals were identified in the tick species collected from animals.
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Prevalence of Anaplasmataceae and Filariidae species in unowned and military dogs in New Caledonia
Veterinary Medicine and Science, 2018Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Olivier Cabre, Oleg MediannikovAbstract:Dogs are competent reservoir hosts of several zoonotic agents, including Filariidae nematodes and Anaplasmataceae family bacteria. The latter family unites human and veterinary pathogens (Anaplasma, Ehrlichia and Neorickettsia bacteria) with Wolbachia, some of which are obligatory endosymbionts of pathogenic filarial nematodes. The epidemiology of Anaplasmataceae and Filariidae species infecting dogs living in kennels in New Caledonia was studied. 64 EDTA blood samples were screened for the presence of Anaplasmataceae and filarial nematodes. Molecular study was conducted using primers and probe targeting the of 23S rRNA long fragment of Anaplasmataceae species. Next, all blood sample was screened for the presence of Filariidae species targeting the primers and probe targeting the COI gene, as well as primers targeting the COI and 5S rRNA genes of all filarial worms. Anaplasma platys was identified in 8/64 (12.5, 95% confidence interval [CI]: 4.4-20.6%) and Wolbachia endosymbiont of Dirofilaria immitis in 8/64 (12.5%, CI: 4.4-20.6%). Filariidae species investigation was performed and showed that 11/64 (17.2%, CI: 7.9-26.4%) dogs were infected with D. immitis, whereas, 2/64 (3.1%, CI: 0.0-7.3%) were infected with Acanthocheilonema reconditum. Finally, we checked the occurrence of co-infection between Anaplasmataceae and Filariidae species. Co-occurrence with Wolbachia endosymbiont of D. immitis was observed in seven dogs, one dog was co-infected with A. platys and A. reconditum and another was co-infected with Wolbachia endosymbiont of D. immitis and A. reconditum. These results are the first report of Anaplasmataceae and Filariidae occurring in dogs in New Caledonia.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites & vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Oleg MediannikovAbstract:Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, “Candidatus Anaplasma corsicanum”, “Candidatus Anaplasma mediterraneum” were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites and Vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Djamel Tahir, Oleg MediannikovAbstract:Backgrounds: Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. Methods: In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Results: Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, ``Candidatus Anaplasma corsicanum'', ``Candidatus Anaplasma mediterraneum'' were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. Conclusions: To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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natural Anaplasmataceae infection in rhipicephalus bursa ticks collected from sheep in the french basque country
Ticks and Tick-borne Diseases, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Frederic Rousseau, Bernard Davoust, Didier Raoult, Oleg MediannikovAbstract:Rhipicephalus bursa is one of 79 species of the genus Rhipicephalus in ă the family of Ixodidae. In this study, we investigated Anaplasmataceae ă bacteria associated with R. bursa collected after an epizootic outbreak ă of ovine anaplasmosis. 76 adult ticks, (60 male and 16 female ticks), ă were removed from sheep in two farms and all identified as R. bursa, all ă females were partially engorged. We found that 50% of the ticks were ă positive in the initial Anaplasmataceae qPCR screening. Bacterial ă species was identified by analyzing the sequences of amplicons of 23S ă rRNA, groEL and rpoB genes. 22.4% of ticks contained DNA of Anaplasma ă phagocytophilum and 7.9% the DNA of Anaplasma ovis. Based on 23S rRNA ă and groEL genes analysis, we found that 19.7% of ticks contained a ă potentially new species of Ehrlichia. We propose the status of ă Candidatus for this uncultured species and we provisionally name it ă Candidatus Ehrlichia urmitei. No Wolbachia were identified. These ă results show that R. bursa can be a carrier of Anaplasmataceae bacteria. ă (C) 2016 Elsevier GmbH. All rights reserved.
Bernard Davoust - One of the best experts on this subject based on the ideXlab platform.
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molecular investigation and phylogeny of species of the Anaplasmataceae infecting animals and ticks in senegal
Parasites & Vectors, 2019Co-Authors: Tinhinene Ameur, Mustapha Dahmani, Hubert Bassene, Masse Sambou, Pierre Scandola, Bernard Davoust, Oleg MediannikovAbstract:Our study aimed to assess the diversity of the species of Anaplasmataceae in Senegal that infect animals and ticks in three areas: near Keur Momar Sarr (northern region), Dielmo and Diop (Sine Saloum, central region of Senegal), and in Casamance (southern region of Senegal). A total of 204 ticks and 433 blood samples were collected from ruminants, horses, donkeys and dogs. Ticks were identified morphologically and by molecular characterization targeting the 12S rRNA gene. Molecular characterization of species of Anaplasmataceae infecting Senegalese ticks and animals was conducted using the 23S rRNA, 16S rRNA, rpoB and groEL genes. Ticks were identified as Rhipicephalus evertsi evertsi (84.3%), Hyalomma rufipes (8.3%), Hyalomma impeltatum (4.9%), R. bursa (1.5%) and R. muhsamae (0.9%). The overall prevalence of Anaplasmataceae infection in ticks was 0.9%, whereas 41.1% of the sampled animals were found infected by one of the species belonging to this family. We identified the pathogen Anaplasma ovis in 55.9% of sheep, A. marginale and A. centrale in 19.4% and 8.1%, respectively, of cattle, as well as a putative new species of Anaplasmataceae. Two Anaplasma species commonly infecting ruminants were identified. Anaplasma cf. platys, closely related to A. platys was identified in 19.8% of sheep, 27.7% of goats and 22.6% of cattle, whereas a putative new species, named here provisionally “Candidatus Anaplasma africae”, was identified in 3.7% of sheep, 10.3% of goats and 8.1% of cattle. Ehrlichia canis and Anaplasma platys were identified only from dogs sampled in the Keur Momar Sarr area. Ehrlichia canis was identified in 18.8% of dogs and two R. e. evertsi ticks removed from the same sheep. Anaplasma platys was identified in 15.6% of dogs. Neither of the dogs sampled from Casamance region nor the horses and donkeys sampled from Keur Momar Sarr area were found infected by an Anaplasmataceae species. This study presents a summary of Anaplasmataceae species that infect animals and ticks in three areas from the northern, central and southern regions of Senegal. To our knowledge, our findings demonstrate for the first time the presence of multiple Anaplasmataceae species that infect ticks and domestic animals in Senegal. We recorded two potentially new species commonly infecting ruminants named here provisionally as Anaplasma cf. platys and “Candidatus Anaplasma africae”. However, E. canis was the only species identified and amplified from ticks. None of the other Anaplasmataceae species identified in animals were identified in the tick species collected from animals.
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Prevalence of Anaplasmataceae and Filariidae species in unowned and military dogs in New Caledonia
Veterinary Medicine and Science, 2018Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Olivier Cabre, Oleg MediannikovAbstract:Dogs are competent reservoir hosts of several zoonotic agents, including Filariidae nematodes and Anaplasmataceae family bacteria. The latter family unites human and veterinary pathogens (Anaplasma, Ehrlichia and Neorickettsia bacteria) with Wolbachia, some of which are obligatory endosymbionts of pathogenic filarial nematodes. The epidemiology of Anaplasmataceae and Filariidae species infecting dogs living in kennels in New Caledonia was studied. 64 EDTA blood samples were screened for the presence of Anaplasmataceae and filarial nematodes. Molecular study was conducted using primers and probe targeting the of 23S rRNA long fragment of Anaplasmataceae species. Next, all blood sample was screened for the presence of Filariidae species targeting the primers and probe targeting the COI gene, as well as primers targeting the COI and 5S rRNA genes of all filarial worms. Anaplasma platys was identified in 8/64 (12.5, 95% confidence interval [CI]: 4.4-20.6%) and Wolbachia endosymbiont of Dirofilaria immitis in 8/64 (12.5%, CI: 4.4-20.6%). Filariidae species investigation was performed and showed that 11/64 (17.2%, CI: 7.9-26.4%) dogs were infected with D. immitis, whereas, 2/64 (3.1%, CI: 0.0-7.3%) were infected with Acanthocheilonema reconditum. Finally, we checked the occurrence of co-infection between Anaplasmataceae and Filariidae species. Co-occurrence with Wolbachia endosymbiont of D. immitis was observed in seven dogs, one dog was co-infected with A. platys and A. reconditum and another was co-infected with Wolbachia endosymbiont of D. immitis and A. reconditum. These results are the first report of Anaplasmataceae and Filariidae occurring in dogs in New Caledonia.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites & vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Oleg MediannikovAbstract:Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, “Candidatus Anaplasma corsicanum”, “Candidatus Anaplasma mediterraneum” were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites and Vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Djamel Tahir, Oleg MediannikovAbstract:Backgrounds: Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. Methods: In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Results: Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, ``Candidatus Anaplasma corsicanum'', ``Candidatus Anaplasma mediterraneum'' were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. Conclusions: To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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natural Anaplasmataceae infection in rhipicephalus bursa ticks collected from sheep in the french basque country
Ticks and Tick-borne Diseases, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Frederic Rousseau, Bernard Davoust, Didier Raoult, Oleg MediannikovAbstract:Rhipicephalus bursa is one of 79 species of the genus Rhipicephalus in ă the family of Ixodidae. In this study, we investigated Anaplasmataceae ă bacteria associated with R. bursa collected after an epizootic outbreak ă of ovine anaplasmosis. 76 adult ticks, (60 male and 16 female ticks), ă were removed from sheep in two farms and all identified as R. bursa, all ă females were partially engorged. We found that 50% of the ticks were ă positive in the initial Anaplasmataceae qPCR screening. Bacterial ă species was identified by analyzing the sequences of amplicons of 23S ă rRNA, groEL and rpoB genes. 22.4% of ticks contained DNA of Anaplasma ă phagocytophilum and 7.9% the DNA of Anaplasma ovis. Based on 23S rRNA ă and groEL genes analysis, we found that 19.7% of ticks contained a ă potentially new species of Ehrlichia. We propose the status of ă Candidatus for this uncultured species and we provisionally name it ă Candidatus Ehrlichia urmitei. No Wolbachia were identified. These ă results show that R. bursa can be a carrier of Anaplasmataceae bacteria. ă (C) 2016 Elsevier GmbH. All rights reserved.
Philippe Parola - One of the best experts on this subject based on the ideXlab platform.
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molecular detection of microorganisms in lice collected from farm animals in northeastern algeria
Comparative Immunology Microbiology and Infectious Diseases, 2020Co-Authors: Basma Ouarti, Souad Righi, Ahmed Benakhla, Oleg Mediannikov, Didier Raoult, Philippe ParolaAbstract:Abstract Lice (Phthiraptera) are highly specific insects organized into four suborders (Anoplura, amblycera, ischnocera and rhynchophthirina). Lice may affect human and animal health. Our objective was to study the bacterial community of lice collected in Algeria. Using molecular tools, we were able to identify by real time PCR the presence of Coxiella burnetii DNA in 1% (3/300) Linognathus africanus and in 0.3% (1/300) Linognathus vituli collected from goats and cattle respectively. We also detected the presence of Anaplasmataceae bacteria in Bovicola bovis, L. vituli from cattle and in L. africanus from goats. By standard PCR’s and sequencing, we were able to identify Anaplasma ovis in L. africanus as well as a novel Anaplasmataceae sp genotype corresponding probably to a new genus within this family.
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Update on Tick-Borne Bacterial Diseases in Travelers
Current Infectious Disease Reports, 2018Co-Authors: Carole Eldin, Philippe ParolaAbstract:Purpose of Review Ticks are the second most important vectors of infectious diseases after mosquitoes worldwide. The growth of international tourism including in rural and remote places increasingly exposes travelers to tick bite. Our aim was to review the main tick-borne infectious diseases reported in travelers in the past 5 years. Recent Findings In recent years, tick-borne bacterial diseases have emerged in travelers including spotted fever group (SFG) rickettsioses, borrelioses, and diseases caused by bacteria of the Anaplasmataceae family. Summary African tick-bite fever, due to Rickettsia africae, is the most frequent agent reported in travelers returned from Sub-Saharan areas. Other SFG agents are increasingly reported in travelers, and clinicians should be aware of them. Lyme disease can be misdiagnosed in Southern countries. Organisms causing tick-borne relapsing fever are neglected pathogens worldwide, and reports in travelers have allowed the description of new species. Infections due to Anaplasmataceae bacteria are more rarely described in travelers, but a new species of Neoehrlichia has recently been detected in a traveler. The treatment of these infections relies on doxycycline, and travelers should be informed before the trip about prevention measures against tick bites.
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Detection of relapsing fever Borrelia spp., Bartonella spp. and Anaplasmataceae bacteria in argasid ticks in Algeria
PLoS Neglected Tropical Diseases, 2017Co-Authors: Ismail Lafri, Oleg Mediannikov, Didier Raoult, Hamza Leulmi, Reda Lalout, Idir Bitam, Basma El Hamzaoui, Mohamed Chergui, Mohamed Karakellah, Philippe ParolaAbstract:Background: Argasid ticks (soft ticks) are blood-feeding arthropods that can parasitize rodents, birds, humans, livestock and companion animals. Ticks of the Ornithodoros genus are known to be vectors of relapsing fever borreliosis in humans. In Algeria, little is known about relapsing fever borreliosis and other bacterial pathogens transmitted by argasid ticks. Methodology/Principal findings: Between May 2013 and October 2015, we investigated the presence of soft ticks in 20 rodent burrows, 10 yellow-legged gull (Larus michahellis) nests and animal shelters in six locations in two different bioclimatic zones in Algeria. Six species of argasid ticks were identified morphologically and through 16S rRNA gene sequencing. The presence and prevalence of Borrelia spp., Bartonella spp., Rickettsia spp. and Anaplasmataceae was assessed by qPCR template assays in each specimen. All qPCR-positive samples were confirmed by standard PCR, followed by sequencing the amplified fragments. Two Borrelia species were identified: Borrelia hispanica in Ornithodoros occidentalis in Mostaganem, and Borrelia cf. turicatae in Carios capensis in Algiers. One new Bartonella genotype and one new Anaplasmataceae genotype were also identified in Argas persicus. Conclusions The present study highlights the presence of relapsing fever borreliosis agents, although this disease is rarely diagnosed in Algeria. Other bacteria of unknown pathogenicity detected in argasid ticks which may bite humans deserve further investigation.
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Detection of Anaplasmataceae in ticks collected in Morocco
Clinical Microbiology and Infection, 2009Co-Authors: Piseth Seng, Philippe Parola, M'hammed Sarih, Cristina Socolovschi, Najma Boudebouch, Mohammed Hassar, P. BrouquiAbstract:Bacteria within the Anaplasmataceae include Gram-negative intracellular bacteria that have been known for a long time as the agents of veterinary diseases. However, in the recent years, five members of Anaplasmataceae have been reported to infect humans, including Anaplasma phagocytophilum, the agent of human granulocytic anaplasmosis, Ehrlichia chaffeensis, the agent of human monocytic ehrlichiosis, and E. ewingii, E. canis and Neorickettsia sennetsu [1]. The abundance of ticks in North Africa represents potential risks for animal and human public health. However, agents within the Anaplasmataceae family have been poorly investigated in North Africa, including in Morocco. In this work, we analysed ticks collected in this country for evidence of infection by Anaplasmataceae.
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Prevalence of Anaplasmataceae and Filariidae species in unowned and military dogs in New Caledonia
Veterinary Medicine and Science, 2018Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Olivier Cabre, Oleg MediannikovAbstract:Dogs are competent reservoir hosts of several zoonotic agents, including Filariidae nematodes and Anaplasmataceae family bacteria. The latter family unites human and veterinary pathogens (Anaplasma, Ehrlichia and Neorickettsia bacteria) with Wolbachia, some of which are obligatory endosymbionts of pathogenic filarial nematodes. The epidemiology of Anaplasmataceae and Filariidae species infecting dogs living in kennels in New Caledonia was studied. 64 EDTA blood samples were screened for the presence of Anaplasmataceae and filarial nematodes. Molecular study was conducted using primers and probe targeting the of 23S rRNA long fragment of Anaplasmataceae species. Next, all blood sample was screened for the presence of Filariidae species targeting the primers and probe targeting the COI gene, as well as primers targeting the COI and 5S rRNA genes of all filarial worms. Anaplasma platys was identified in 8/64 (12.5, 95% confidence interval [CI]: 4.4-20.6%) and Wolbachia endosymbiont of Dirofilaria immitis in 8/64 (12.5%, CI: 4.4-20.6%). Filariidae species investigation was performed and showed that 11/64 (17.2%, CI: 7.9-26.4%) dogs were infected with D. immitis, whereas, 2/64 (3.1%, CI: 0.0-7.3%) were infected with Acanthocheilonema reconditum. Finally, we checked the occurrence of co-infection between Anaplasmataceae and Filariidae species. Co-occurrence with Wolbachia endosymbiont of D. immitis was observed in seven dogs, one dog was co-infected with A. platys and A. reconditum and another was co-infected with Wolbachia endosymbiont of D. immitis and A. reconditum. These results are the first report of Anaplasmataceae and Filariidae occurring in dogs in New Caledonia.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites & vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Didier Raoult, Djamel Tahir, Oleg MediannikovAbstract:Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, “Candidatus Anaplasma corsicanum”, “Candidatus Anaplasma mediterraneum” were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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Molecular investigation and phylogeny of Anaplasmataceae species infecting domestic animals and ticks in Corsica, France
Parasites and Vectors, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Bernard Davoust, Djamel Tahir, Oleg MediannikovAbstract:Backgrounds: Corsica is a French island situated in the Mediterranean Sea. The island provides suitable natural conditions to study disease ecology, especially tick-borne diseases and emerging diseases in animals and ticks. The family Anaplasmataceae is a member of the order Rickettsiales; it includes the genera Anaplasma, Ehrlichia, Neorickettsia and Wolbachia. Anaplasmosis and ehrlichiosis traditionally refer to diseases caused by obligate intracellular bacteria of the genera Anaplasma and Ehrlichia. The aim of this study was to identify and estimate the prevalence of Anaplasmataceae species infecting domestic animals and ticks in Corsica. Methods: In this study, 458 blood samples from sheep, cattle, horses, goats, dogs, and 123 ticks removed from cattle, were collected in Corsica. Quantitative real-time PCR screening and genetic characterisation of Anaplasmataceae bacteria were based on the 23S rRNA, rpoB and groEl genes. Results: Two tick species were collected in the present study: Rhipicephalus bursa (118) and Hyalomma marginatum marginatum (5). Molecular investigation showed that 32.1% (147/458) of blood samples were positive for Anaplasmataceae infection. Anaplasma ovis was identified in 42.3% (93/220) of sheep. Anaplasma marginale was amplified from 100% (12/12) of cattle and two R. bursa (2/123). Several potentially new species were also identified: Anaplasma cf. ovis, ``Candidatus Anaplasma corsicanum'', ``Candidatus Anaplasma mediterraneum'' were amplified from 17.3% (38/220) of sheep, and Anaplasma sp. marginale-like was amplified from 80% (4/5) of goats. Finally, one R. bursa tick was found to harbour the DNA of E. canis. All samples from horses and dogs were negative for Anaplasmataceae infection. Conclusions: To our knowledge, this study is the first epidemiological survey on Anaplasmataceae species infecting animals and ticks in Corsica and contributes toward the identification of current Anaplasmataceae species circulating in Corsica.
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natural Anaplasmataceae infection in rhipicephalus bursa ticks collected from sheep in the french basque country
Ticks and Tick-borne Diseases, 2017Co-Authors: Mustapha Dahmani, Florence Fenollar, Frederic Rousseau, Bernard Davoust, Didier Raoult, Oleg MediannikovAbstract:Rhipicephalus bursa is one of 79 species of the genus Rhipicephalus in ă the family of Ixodidae. In this study, we investigated Anaplasmataceae ă bacteria associated with R. bursa collected after an epizootic outbreak ă of ovine anaplasmosis. 76 adult ticks, (60 male and 16 female ticks), ă were removed from sheep in two farms and all identified as R. bursa, all ă females were partially engorged. We found that 50% of the ticks were ă positive in the initial Anaplasmataceae qPCR screening. Bacterial ă species was identified by analyzing the sequences of amplicons of 23S ă rRNA, groEL and rpoB genes. 22.4% of ticks contained DNA of Anaplasma ă phagocytophilum and 7.9% the DNA of Anaplasma ovis. Based on 23S rRNA ă and groEL genes analysis, we found that 19.7% of ticks contained a ă potentially new species of Ehrlichia. We propose the status of ă Candidatus for this uncultured species and we provisionally name it ă Candidatus Ehrlichia urmitei. No Wolbachia were identified. These ă results show that R. bursa can be a carrier of Anaplasmataceae bacteria. ă (C) 2016 Elsevier GmbH. All rights reserved.
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Natural Anaplasmataceae infection in Rhipicephalus bursa ticks collected from sheep in the French Basque Country.
Ticks and tick-borne diseases, 2016Co-Authors: Mustapha Dahmani, Florence Fenollar, Frederic Rousseau, Bernard Davoust, Didier Raoult, Oleg MediannikovAbstract:Rhipicephalus bursa is one of 79 species of the genus Rhipicephalus in the family of Ixodidae. In this study, we investigated Anaplasmataceae bacteria associated with R. bursa collected after an epizootic outbreak of ovine anaplasmosis. 76 adult ticks, (60 male and 16 female ticks), were removed from sheep in two farms and all identified as R. bursa, all females were partially engorged. We found that 50% of the ticks were positive in the initial Anaplasmataceae qPCR screening. Bacterial species was identified by analyzing the sequences of amplicons of 23S rRNA, groEL and rpoB genes. 22.4% of ticks contained DNA of Anaplasma phagocytophilum and 7.9% the DNA of Anaplasma ovis. Based on 23S rRNA and groEL genes analysis, we found that 19.7% of ticks contained a potentially new species of Ehrlichia. We propose the status of Candidatus for this uncultured species and we provisionally name it Candidatus Ehrlichia urmitei. No Wolbachia were identified. These results show that R. bursa can be a carrier of Anaplasmataceae bacteria.