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Thiago F Martins - One of the best experts on this subject based on the ideXlab platform.
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new records of amblyomma multipunctum and amblyomma naponense from ecuador with description of a multipunctum nymph
Journal of Parasitology, 2013Co-Authors: Marcelo Bahia Labruna, Pablo Henrique Nunes, Francisco Portero, Thiago F Martins, Francisco B. Costa, José Manuel VenzalAbstract:Abstract: We provide new data for the ticks Amblyomma multipunctum and Amblyomma naponense from Ecuador. In addition, we describe the nymph of A. multipunctum for the first time. During December 2012, ticks were collected by dragging in forest trails of 1 locality at Puyo, Pastaza Province (elevation 979 m), and another locality at Papallacta, Napo Province (3,474 m). A total of 10 adults of A. naponense were collected at Puyo, whereas 27 adults and 3 Nymphs of A. multipunctum were collected at Papallacta. Compared to sequences of a fragment of the mitochondrial 16S rDNA gene of adult and nymphal ticks, the sequence of an Amblyomma nymph was identical to the sequences generated from the A. multipunctum adults. The 3 collected Nymphs (including the 1 used for molecular analysis) had the same morphotype, and were used for the first morphological description of the nymphal stage of A. multipunctum. Sequences generated from the A. naponense specimens were closest (97% identity by BLAST) to a corresponding se...
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Morphological description of the nymphal stage of Amblyomma geayi and new nymphal records of Amblyomma parkeri
Ticks and Tick-borne Diseases, 2013Co-Authors: Thiago F Martins, Wanessa Batista Lima Oliveira, Pablo Henrique Nunes, Lilian R.m. Sá, Julio C. Souza, Alessandra Scofield, Fernanda Ampuero, Darci Moraes Barros-battesti, Diego G Ramirez, Marcelo Bahia LabrunaAbstract:Abstract The external morphology of the nymph of Amblyomma geayi Neumann is described by optical and scanning electron microscopy. Unfed Nymphs were obtained from an engorged A. geayi female, which had been collected on a sloth ( Bradypus variegatus ) from Belem municipality, State of Para, northern Brazil, and was kept under laboratory conditions. With the present description, we propose a modification of a taxonomic key published in 2010 for the Amblyomma Nymphs that occur in Brazil, through the inclusion of A. geayi . The nymph of A. geayi is morphologically very similar to the nymph of Amblyomma parkeri Fonseca and Aragao, with only slight morphological differences related to scutal surface and punctuations (more shagreened and less punctuated in A. geayi ). These 2 Nymphs differ from all other known Amblyomma Nymphs from Brazil by the combination of auriculae present as small posterolateral rounded projections, eyes located at the level of the scutal midlength, and a rounded hypostome. These nymphal similarities as well the morphology of the adult stage corroborate previous studies that showed that A. geayi and A. parkeri are genetically closely related. Unpublished host records of the Nymphs of both A. geayi and A. parkeri are provided. Established populations of A. geayi and A. parkeri seem to be geographically separated, since all confirmed records of A. geayi are from the northern half of South America (mainly the Amazonian region) and Central America, whereas all known records of A. parkeri are from the Atlantic rainforest biome in northeastern, southeastern, and southern Brazil.
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Ticks (Acari: Ixodidae) associated with small terrestrial mammals in the state of Minas Gerais, southeastern Brazil
Experimental and Applied Acarology, 2012Co-Authors: Danilo Goncalves Saraiva, Thiago F Martins, Darci Moraes Barros-battesti, Valeria C Onofrio, Gislene F S R Fournier, Karla P G Leal, Flavia N Vieira, Edeltrudes M V C Câmara, Claudia Guimaraes Costa, Alberto A. GuglielmoneAbstract:From June 2005 to November 2010, 43 small mammals encompassing 6 species of Didelphimorphia, 8 species of Rodentia, and 1 species of Lagomorpha were found parasitized by ticks in the state of Minas Gerais, southeastern Brazil. Nine tick species, in total 186 specimens, were identified as follows: Amblyomma cajennense (larvae and Nymphs) on opossums and rodents; Amblyomma ovale (Nymphs) on rodents; Amblyomma parvum (Nymphs) on rodents; Amblyomma coelebs (Nymphs) on opossums; Amblyomma dubitatum (nymph) on opossums; Ixodes amarali (females, Nymphs, and larvae) on opossums and rodents; Ixodes loricatus (male, females, nymph) on opossums; Ixodes schulzei (female) on rodents; and Haemaphysalis leporispalustris (female) on rabbits. Most of the tick-host associations found in the present study have never been recorded in the literature; those include three new host records for I. amarali , four for A. cajennense , one for A. dubitatum , two for A. ovale , and one for A. coelebs . In addition, we provide the first record of A. coelebs in the state of Minas Gerais.
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ticks acari ixodidae associated with small terrestrial mammals in the state of minas gerais southeastern brazil
Experimental and Applied Acarology, 2012Co-Authors: Danilo Goncalves Saraiva, Thiago F Martins, Valeria C Onofrio, Darci Moraes Barrosbattesti, Gislene Fatima Da Silva Rocha Fournier, Karla P G Leal, Flavia N Vieira, Edeltrudes M V C Câmara, Claudia Guimaraes Costa, Alberto A. GuglielmoneAbstract:From June 2005 to November 2010, 43 small mammals encompassing 6 species of Didelphimorphia, 8 species of Rodentia, and 1 species of Lagomorpha were found parasitized by ticks in the state of Minas Gerais, southeastern Brazil. Nine tick species, in total 186 specimens, were identified as follows: Amblyomma cajennense (larvae and Nymphs) on opossums and rodents; Amblyomma ovale (Nymphs) on rodents; Ambly- omma parvum (Nymphs) on rodents; Amblyomma coelebs (Nymphs) on opossums; Amblyomma dubitatum (nymph) on opossums; Ixodes amarali (females, Nymphs, and larvae) on opossums and rodents; Ixodes loricatus (male, females, nymph) on opossums; Ixodes schulzei (female) on rodents; and Haemaphysalis leporispalustris (female) on rabbits. Most of the tick-host associations found in the present study have never been
Lucy Gilbert - One of the best experts on this subject based on the ideXlab platform.
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environmental determinants of ixodes ricinus ticks and the incidence of borrelia burgdorferi sensu lato the agent of lyme borreliosis in scotland
Parasitology, 2013Co-Authors: Marianne C James, Alan S Bowman, Ken J Forbes, F Lewis, J E Mcleod, Lucy GilbertAbstract:Lyme borreliosis (LB) is the most common arthropod-borne disease of humans in the Northern hemisphere. In Europe, the causative agent, Borrelia burgdorferi sensu lato complex, is principally vectored by Ixodes ricinus ticks. The aim of this study was to identify environmental factors influencing questing I. ricinus nymph abundance and B. burgdorferi s.l. infection in questing Nymphs using a large-scale survey across Scotland. Ticks, host dung and vegetation were surveyed at 25 woodland sites, and climatic variables from a Geographical Information System (GIS) were extracted for each site. A total of 2397 10 m2 transect surveys were conducted and 13 250 I. ricinus Nymphs counted. Questing Nymphs were assayed for B. burgdorferi s.l. and the average infection prevalence was 5·6% (range 0·8–13·9%). More questing Nymphs and higher incidence of B. burgdorferi s.l. infection were found in areas with higher deer abundance and in mixed/deciduous compared to coniferous forests, as well as weaker correlations with season, altitude, rainfall and ground vegetation. No correlation was found between nymph abundance and infection prevalence within the ranges encountered. An understanding of the environmental conditions associated with tick abundance and pathogen prevalence may be used to reduce risk of exposure and to predict future pathogen prevalence and distributions under environmental changes.
Valerie Choumet - One of the best experts on this subject based on the ideXlab platform.
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infection of ixodes ricinus by borrelia burgdorferi sensu lato in peri urban forests of france
PLOS ONE, 2017Co-Authors: Axelle Marchant, Alain Le Coupanec, Claire Joly, Emeline Perthame, Natacha Sertour, Martine Garnier, Vincent Godard, Elisabeth Ferquel, Valerie ChoumetAbstract:Lyme borreliosis is the most common tick-borne disease in the northern hemisphere. In Europe, it is transmitted by Ixodes ticks that carry bacteria belonging to the Borrelia burgdorferi sensu lato complex. The objective of this work was to explore eco-epidemiological factors of Lyme borreliosis in peri-urban forests of France (Senart, Notre-Dame and Rambouillet). We investigated whether the introduction of Tamias sibiricus in Senart could alter the density of infected ticks. Moreover, the density and tick infection were investigated according to the tree species found in various patches of Senart forest. For this purpose, ticks were sampled during 3 years. In the Senart forest, the density of nymph and adult ticks showed no significant difference between 2008, 2009 and 2011. The nymph density varied significantly as a function of the month of collection. Regarding the Nymphs, a higher rate of infection and infected density were found in 2009. Plots with chipmunks (C) presented a lower density of both Nymphs and adult ticks than plots without chipmunks (NC) did. A higher rate of infection of Nymphs with Borrelia was seen in C plots. The prevalence of the various species of Borrelia was also found to vary between C and NC plots with the year of the collect. The presence of chestnut trees positively influenced the density of both Nymphs and adults. The infected nymph density showed a significant difference depending on the peri-urban forest studied, Senart being higher than Rambouillet. The prevalence of Borrelia species also differed between the various forests studied. Concerning the putative role that Tamias sibiricus may play in the transmission of Borrelia, our results suggest that its presence is correlated with a higher rate of infection of questing ticks by Borrelia genospecies and if its population increases, it could play a significant role in the risk of transmission of Lyme borreliosis.
Marianne C James - One of the best experts on this subject based on the ideXlab platform.
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environmental determinants of ixodes ricinus ticks and the incidence of borrelia burgdorferi sensu lato the agent of lyme borreliosis in scotland
Parasitology, 2013Co-Authors: Marianne C James, Alan S Bowman, Ken J Forbes, F Lewis, J E Mcleod, Lucy GilbertAbstract:Lyme borreliosis (LB) is the most common arthropod-borne disease of humans in the Northern hemisphere. In Europe, the causative agent, Borrelia burgdorferi sensu lato complex, is principally vectored by Ixodes ricinus ticks. The aim of this study was to identify environmental factors influencing questing I. ricinus nymph abundance and B. burgdorferi s.l. infection in questing Nymphs using a large-scale survey across Scotland. Ticks, host dung and vegetation were surveyed at 25 woodland sites, and climatic variables from a Geographical Information System (GIS) were extracted for each site. A total of 2397 10 m2 transect surveys were conducted and 13 250 I. ricinus Nymphs counted. Questing Nymphs were assayed for B. burgdorferi s.l. and the average infection prevalence was 5·6% (range 0·8–13·9%). More questing Nymphs and higher incidence of B. burgdorferi s.l. infection were found in areas with higher deer abundance and in mixed/deciduous compared to coniferous forests, as well as weaker correlations with season, altitude, rainfall and ground vegetation. No correlation was found between nymph abundance and infection prevalence within the ranges encountered. An understanding of the environmental conditions associated with tick abundance and pathogen prevalence may be used to reduce risk of exposure and to predict future pathogen prevalence and distributions under environmental changes.
Axelle Marchant - One of the best experts on this subject based on the ideXlab platform.
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infection of ixodes ricinus by borrelia burgdorferi sensu lato in peri urban forests of france
PLOS ONE, 2017Co-Authors: Axelle Marchant, Alain Le Coupanec, Claire Joly, Emeline Perthame, Natacha Sertour, Martine Garnier, Vincent Godard, Elisabeth Ferquel, Valerie ChoumetAbstract:Lyme borreliosis is the most common tick-borne disease in the northern hemisphere. In Europe, it is transmitted by Ixodes ticks that carry bacteria belonging to the Borrelia burgdorferi sensu lato complex. The objective of this work was to explore eco-epidemiological factors of Lyme borreliosis in peri-urban forests of France (Senart, Notre-Dame and Rambouillet). We investigated whether the introduction of Tamias sibiricus in Senart could alter the density of infected ticks. Moreover, the density and tick infection were investigated according to the tree species found in various patches of Senart forest. For this purpose, ticks were sampled during 3 years. In the Senart forest, the density of nymph and adult ticks showed no significant difference between 2008, 2009 and 2011. The nymph density varied significantly as a function of the month of collection. Regarding the Nymphs, a higher rate of infection and infected density were found in 2009. Plots with chipmunks (C) presented a lower density of both Nymphs and adult ticks than plots without chipmunks (NC) did. A higher rate of infection of Nymphs with Borrelia was seen in C plots. The prevalence of the various species of Borrelia was also found to vary between C and NC plots with the year of the collect. The presence of chestnut trees positively influenced the density of both Nymphs and adults. The infected nymph density showed a significant difference depending on the peri-urban forest studied, Senart being higher than Rambouillet. The prevalence of Borrelia species also differed between the various forests studied. Concerning the putative role that Tamias sibiricus may play in the transmission of Borrelia, our results suggest that its presence is correlated with a higher rate of infection of questing ticks by Borrelia genospecies and if its population increases, it could play a significant role in the risk of transmission of Lyme borreliosis.
