The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
W Beck - One of the best experts on this subject based on the ideXlab platform.
-
Efficacy and safety of selamectin (Stronghold®/RevolutionTM) used off-label in exotic pets.
International Journal of Applied Research in Veterinary Medicine, 2020Co-Authors: Maggie Fisher, W Beck, Melanie J. HutchinsonAbstract:Selamectin, a novel avermectin compound, is reviewed and discussed for its efficacy against naturally occurring infestations and infections of Ctenocephalides felis, Otodectes cynotis, and Dirofilaria immitis in ferrets; different flea species, Psoroptes cuniculi, Cheyletiella spp, and Leporacarus gibbus in rabbits; different chewing lice, Trixacarus caviae, and Chirodiscoides caviae in guinea pigs; Ornithonyssus bacoti and Demodex spp in hamsters and gerbils; Polyplax spp and fur mites in rats and mice; different flea species, Demodex erinacei, Crenosoma striatum, and Capillaria spp in hedgehogs; and chewing lice in birds. The efficacy and safety of selamectin used off-label in exotic pets are detailed and discussed in this paper. Practical experiences and results suggest that selamectin is effective against a variety of ecto- and endoparasites.
-
Milben als Zoonoseerreger des Menschen
hautnah, 2016Co-Authors: W BeckAbstract:Verschiedene Milbenspezies, die vom Tier stammen, können temporär den Menschen befallen. Bei unklaren erythematösen, oft juckenden Hautreaktionen sollten diese als mögliche Ursache differenzialdiagnostisch berücksichtigt werden. Für eine Pseudoskabies sind insbesondere Landwirte, Veterinäre und Tierbesitzer besonders exponiert. Diese, i. d. R. selbstlimitierenden Erkrankungen werden oft nicht erkannt. Wichtige Milbenspezies wie Sarcoptes scabiei, Notoedres cati, Cheyletiella spp. , Dermanyssus gallinae, Ornithonyssus bacoti und Ophionyssus natricis können auf das menschliche Integument übergehen und dort Symptome hervorrufen. Different mite species occuring in animals may infest humans temporarily. Such agents should be considered a possible cause of erythemateous and sometimes pruritic skin reactions of unclear origin. Pseudo-scabies is a common problem in occupationally exposed humans, e. g. farmers, veterinarians or pet owners. Those selflimiting dermatoses may often be misdiagnosed. Several species including Sarcoptes scabiei, Notoedres cati, Cheyletiella spp. , Dermanyssus gallinae, Ornithonyssus bacoti, and Ophionyssus natricis may infest human skin, causing symptoms.
-
tropical rat mites Ornithonyssus bacoti serious ectoparasites
Journal Der Deutschen Dermatologischen Gesellschaft, 2009Co-Authors: W Beck, Regina FolsterholstAbstract:Summary In Germany there is limited information available about the distribution of the tropical rat mite (Ornithonyssus bacoti) in rodents. A few case reports show that this hematophagous mite species may also cause dermatitis in man. Having close body contact to small rodents is an important question for patients with pruritic dermatoses. The definitive diagnosis of this ectopara-sitosis requires the detection of the parasite, which is more likely to be found in the environment of its host (in the cages, in the litter or in corners or cracks of the living area) than on the hosts’ skin itself. A case of infestation with tropical rat mites in a family is reported here. Three mice that had been removed from the home two months before were the reservoir. The mites were detected in a room where the cage with the mice had been placed months ago. Treatment requires the eradication of the parasites on its hosts (by a veterinarian) and in the environment (by an exterminator) with adequate acaricides such as permethrin.
-
occurrence of a house infesting tropical rat mite Ornithonyssus bacoti on murides and human beings
Travel Medicine and Infectious Disease, 2008Co-Authors: W BeckAbstract:Summary In Germany there is little information available about the distribution of the Tropical rat mite ( Ornithonyssus bacoti ) in rodents. A few case reports show that this haematophagous mite species may also cause dermatitis in man. All developmental stages are exclusively bloodfeeder. Three children (4, 11 and 15 years old) of a family and a 23-year-old medical student were attacked by the Tropical rat mite. Prior to the consultation of our institution, the patients’ conditions had been diagnosed as allergic dermatitis of unclear origin and treated by several antiphlogistic agents, however without success. The conclusive diagnosis, Tropical rat mite dermatitis, was based on the identification of the arthropod Ornithonyssus bacoti in the flats of the patients (husbandry of gerbils, etc.). The diagnosis of a Rat mite dermatitis requires the detection of the parasite, which is more likely to be found in the environment of its host than on the hosts’ skin itself.
-
Humanpathogene Milben als Zoonoseerreger
Wiener klinische Wochenschrift, 2006Co-Authors: W Beck, Kurt PfisterAbstract:Different mite species occurring in animals may infest humans temporarily. Such agents should be considered a possible cause of erythemateous and sometimes pruritic skin reactions of unclear origin. Pseudoscabies is a common problem in occupationally exposed humans, e.g. farmers, veterinarians or pet owners. Those selflimiting dermatoses may often be misdiagnosed. Several species including Sarcoptes scabiei , Notoedres cati , Cheyletiella spp., Dermanyssus gallinae , Ornithonyssus bacoti , Ophionyssus natricis and Neotrombicula autumnalis may infest human skin, causing symptoms. Verschiedene von Tieren stammende Milben können temporär den Menschen befallen und sollten daher als mögliche Ursache erythematöser Hautveränderungen, die zum Teil mit Juckreiz einhergehen und ätiologisch unklar erscheinen, Berücksichtigung finden. Besonders beruflich exponierte Personen, wie Landwirte, Veterinäre oder Tierbesitzer sind häufiger von Pseudoskabies infolge Milbeninfestation betroffen. Die Ursachen dieser meist selbstlimitierenden Dermatosen bleiben oft unerkannt. Anhand der Spezies Sarcoptes scabiei , Notoedres cati , Cheyletiella spp., Dermanyssus gallinae , Ornithonyssus bacoti , Ophionyssus natricis und Neotrombicula autumnalis werden die unterschiedlichen Möglichkeiten einer Infestation des Menschen durch humanpathogene Milben dargestellt.
Regina Folsterholst - One of the best experts on this subject based on the ideXlab platform.
-
tropical rat mites Ornithonyssus bacoti serious ectoparasites
Journal Der Deutschen Dermatologischen Gesellschaft, 2009Co-Authors: W Beck, Regina FolsterholstAbstract:Summary In Germany there is limited information available about the distribution of the tropical rat mite (Ornithonyssus bacoti) in rodents. A few case reports show that this hematophagous mite species may also cause dermatitis in man. Having close body contact to small rodents is an important question for patients with pruritic dermatoses. The definitive diagnosis of this ectopara-sitosis requires the detection of the parasite, which is more likely to be found in the environment of its host (in the cages, in the litter or in corners or cracks of the living area) than on the hosts’ skin itself. A case of infestation with tropical rat mites in a family is reported here. Three mice that had been removed from the home two months before were the reservoir. The mites were detected in a room where the cage with the mice had been placed months ago. Treatment requires the eradication of the parasites on its hosts (by a veterinarian) and in the environment (by an exterminator) with adequate acaricides such as permethrin.
Lance A. Durden - One of the best experts on this subject based on the ideXlab platform.
-
Morphological and molecular analysis of Ornithonyssus spp. (Acari: Macronyssidae) from small terrestrial mammals in Brazil
Experimental and Applied Acarology, 2011Co-Authors: Fernanda A. Nieri-bastos, Lance A. Durden, L. Mendoza-uribe, Marcelo B. Labruna, Arlei Marcili, Darci M. Barros-battestiAbstract:Based on chaetotaxy of the dorsal shield, the taxonomic status of many species of Ornithonyssus has been considered invalid, resulting in the synonymy of all Brazilian Ornithonyssus from small terrestrial wild mammals into one of the following four species: Ornithonyssus bacoti (Hirst, 1913 ), Ornithonyssus matogrosso (Fonseca, 1954 ), Ornithonyssus pereirai (Fonseca, 1935 ) or Ornithonyssus wernecki (Fonseca, 1935 ). Despite the revision of this genus in 1980, including all known species worldwide, the knowledge of Ornithonyssus in Brazil has not progressed for more than 40 years. Considering the potential importance of these haematophagous mites in transmitting rickettsial disease agents to animals and humans, we have revised Ornithonyssus species collected from small mammals in Brazil by means of morphological and molecular studies. Types and other material deposited in the Acari Collection of the Instituto Butantan (IBSP) were examined in addition to recently collected specimens. Morphological and genetic analysis of the 16S rDNA mitochondrial gene revealed that small terrestrial mammals in Brazil are parasitized by six species of Ornithonyssus mites: Ornithonyssus brasiliensis (Fonseca, 1939 ), O. matogrosso , O. monteiroi (Fonseca, 1941 ), O. pereirai , O. vitzthumi (Fonseca, 1941 ), and O. wernecki. An illustrated key to females of the valid Brazilian species of Ornithonyssus is included, based on optical and scanning electron microscopy.
-
ECTOPARASITES AND OTHER EPIFAUNISTIC ARTHROPODS OF SYMPATRIC COTTON MICE AND GOLDEN MICE: COMPARISONS AND IMPLICATIONS FOR VECTOR-BORNE ZOONOTIC DISEASES
Journal of Parasitology, 2004Co-Authors: Lance A. Durden, Ram N. Polur, Todd N. Nims, Craig W. Banks, James H OliverAbstract:Ectoparasite and epifaunistic arthropod biodiversity and infestation parameters were compared between 2 sympatric small rodent species, the cotton mouse (Peromyscus gossypinus (Le Conte)) and golden mouse (Ochrotomys nuttalli (Harlan)), in southern Georgia from 1992 to 2003. Because the cotton mouse is known to be a reservoir of more vector-borne zoonotic pathogens than the golden mouse, we hypothesized that it would be parasitized by more ectoparasites that are known to be vectors of these pathogens. Cotton mice (n = 202) were parasitized by 19 species of arthropods, whereas golden mice (n = 46) were parasitized by 12 species. Eleven species of arthropods were recovered from both host species, whereas 7 were recorded only from cotton mice, and 1 species only from golden mice. Infestation prevalences (percent of mice parasitized) were significantly higher for 1 species of arthropod (the tropical rat mite Ornithonyssus bacoti (Hirst)) infesting cotton mice and for 4 species (the flea Peromyscopsylla scotti...
-
Inefficient mechanical transmission of Langat (tick-borne encephalitis virus complex) virus by blood-feeding mites (Acari) to laboratory mice.
Journal of Medical Entomology, 1993Co-Authors: Lance A. Durden, Michael J. TurellAbstract:One day after feeding on a viremic mouse, tropical rat mites, Ornithonyssus bacoti (Hirst), transmitted Langat (tick-borne encephalitis virus complex) virus to a naive suckling mouse in one of four trials. However, no transmissions to naive mice by O. bacoti were recorded either immediately after the viremic blood meal (0/4 trials) or on days 4*.xml18 (0/20 trials). After feeding on a viremic mouse, chicken mites, Dermanyssus gallinae (De Geer), failed to transmit Langat virus to naive suckling mice in any trials (0/24). Although virus failed to replicate in either species of mite, it was detectable in 20% (2/10) of O. bacoti individuals 1 d after a viremic blood meal, but only immediately after the viremic blood meal in 20% (2/10) of D. gallinae mites. Neither mite appears to be an efficient vector of Langat virus.
-
Parasitic arthropods of sympatric opossums, cotton rats, and cotton mice from Merritt Island, Florida.
Journal of Parasitology, 1993Co-Authors: Lance A. Durden, J. S. H. Klompen, James E. KeiransAbstract:: Six species of parasitic arthropods were collected from 12 opossums (Didelphis virginiana), 8 species were obtained from 28 cotton rats (Sigmodon hispidus), and 4 species were collected from 10 cotton mice (Peromyscus gossypinus) from Merritt Island, Brevard County, Florida. The flea Polygenis gwyni was the only parasite that infested all 3 host species, and it was present in very high densities (mean intensity = 73.7) on the opossums. The American dog tick, Dermacentor variabilis, and the tropical rat mite, Ornithonyssus bacoti, both infested 2 host species but were principally associated with opossums and cotton rats, respectively. All remaining arthropod species were confined to single host species, suggesting host specificity by these parasites. The atopomelid mite Didelphilichus serrifer and the myobiid mite Radfordia sigmodontis constitute new state records for Florida. The reptile tick Amblyomma dissimile is recorded from a cotton mouse for the first time; Merritt Island may represent the most northerly location for viable populations of this tick in the U.S.A.
-
Parasitic and phoretic arthropods of sylvatic and commensal white-footed mice (Peromyscus leucopus) in central Tennessee, with notes on Lyme disease.
Journal of Parasitology, 1991Co-Authors: Lance A. Durden, Nixon WilsonAbstract:AssTRAcr: Sixteen species of parasitic or phoretic arthropods were collected from 56 white-footed mice, Peromyscus leucopus, live-trapped in central Tennessee from April through November 1987. Arthropod infestation was compared for mice taken from sylvatic (woodland) versus commensal (household) habitats. Three species were recorded from hosts in both habitats: the sucking louse Hoplopleura hesperomydis, the flea Epitedia wenmanni, and the laelapid mite Androlaelaps casalis. Twelve of the 13 remaining arthropod species were taken only from mice trapped in woodland whereas the phoretic glycyphagid mite Glycyphagus hypudaei was collected only from commensal mice. Arthropod faunas on commensal hosts clearly were impoverished. The 12 additional arthropod species recorded from the woodland mice consisted of 1 nidicolous beetle, Leptinus orientamericanus; 1 bot, Cuterebra fontinella; 3 fleas, Ctenophthalmus pseudagyrtes, Orchopeas leucopus and Peromyscopsylla scotti; 1 tick, Dermacentor variabilis; 2 mesostigmatid mites, Androlaelapsfahrenholzi and Ornithonyssus bacoti; 3 chiggers, Comatacarus americanus, Euschoengastia peromysci, and Leptotrombidium peromysci; and 1 undescribed pygmephorid mite of the genus Pygmephorus. Two nymphal and 100 larval D. variabilis were examined for spirochetes and found to be uninfected.
Anjan Jyoti Nath - One of the best experts on this subject based on the ideXlab platform.
-
Use of scanning electron microscopy to confirm the identity of tropical rat mite (Ornithonyssus bacoti): the cause of rat mite dermatitis
Journal of Parasitic Diseases, 2016Co-Authors: Anjan Jyoti Nath, Saidul Islam, Samyak SahuAbstract:Cutaneous lesions in human patient due to the bite of rat mite Ornithonyssus bacoti are frequently misdiagnosed as allergies, fungal infection, or bacterial infection. Bite lesions in the personnel working in a Laboratory Animal facility which was infested with O. bacoti is reported here along with its therapeutic management. Diagnosis of the parasites obtained from the clothing of the personnel and later from the infested mice colony was based on preliminary light microscopy and confirmed by scanning electron microscopy. The mean length and breadth of adult female mite were 1.13 mm × 0.63 mm. The body is hairy, unsegmented and has four pairs of legs. The gnathostoma has long pointed chelicerae and pedipalp. The dorsal surface has one dorsal shield, and the ventral surface has three shields- sternal, genital and anal shield. Treatment of dermatitis involved antihistaminic drugs for a period of 3–5 days. The skin lesion, characterized by papular erythema, tends to disappear within a period of 4–5 days of antihistaminic treatment. In untreated cases, the lesions disappeared within 7–10 days. Tropical rat mite O. bacoti Hirst, 1931 was identified to be the cause of infestation in the laboratory mice colony of Pasteur Institute of India, Coonoor, Tamil Nadu, predisposing the animal handlers to be temporary host.
-
record of tropical rat mite Ornithonyssus bacoti acari mesostigmata macronyssidae from domestic and peridomestic rodents rattus rattus in nilgiris tamil nadu india
Iranian Journal of Arthropod-borne Diseases, 2016Co-Authors: Pranab Jyoti Bhuyan, Anjan Jyoti NathAbstract:BACKGROUND: Tropical rat mite (Ornithonyssus bacoti) is reported from many parts of the world and is considered important in transmitting rickettsial pathogens. There have been scanty reports on prevalence of this parasite from India. Following a recent report of O. bacoti infestation in a laboratory mice colony from Nilgiris, Tamil Nadu, India, attempts were made to detect the parasite in its natural reservoir, ie the domestic and peridomestic rats (Rattus rattus). METHODS: The National Centre for Disease Control, Coonoor is involved in screening plague in domestic and peridomestic rats in Nilgiris and erstwhile plague endemic areas of Southern India. The parasite samples were identified based on the morphological characteristics attributable to O. bacoti and as per description of published literature. RESULTS: Seven mite samples identified as O. bacoti based on morphological characteristics were isolated incidentally from domestic and peridomestic rodents in and around the hilly districts of Nilgiris, Southern India, during the routine plague surveillance programme. The identification was based on the morphological characteristics attributable to O. bacoti observed under a low power microscope. CONCLUSION: In India, this is probably the first record of isolation of O. bacoti from domestic and peridomestic rodents. Prevalence of such parasite in domestic and peridomestic rats necessitates further investigation on monitoring and surveillance of rickettsial diseases in the locality, as these parasites are considered to be potential vector of transmitting rickettsial pathogens.
Tosson A Morsy - One of the best experts on this subject based on the ideXlab platform.
-
Ecto- and blood parasites affecting Meriones rex trapped in Najran, Saudi Arabia.
Journal of the Egyptian Society of Parasitology, 2001Co-Authors: Tosson A Morsy, El Bahrawy Af, El DakhilAbstract:: Meriones rex or king jird is endemic to Arabia, confined to the south-west of the peninsula. Examination of 25 jirds for arthropod-ectoparasites showed Xenopsylla astia, Ctenocephalides arabicus, Ornithonyssus bacoti and tick nymphs with indices of 0.6, 1.6, 0.64 and 0.24 respectively. The ectoparasites were more on female jirds than on males with indices of 3.8 and 2.0 respectively. Indirect haemagglutination tests for anti-Toxoplsama and anti-Leishmania antibodies showed positive reactions in 5 (20.0%) and 2 (8.0%) jirds respectively. However, neither skin lesion nor protozoal parasites were detected in tissue smears of liver and spleen. The ectoparasites encountered and the sero-positive reactions to Toxoplasma and Leishmania denote that the king jird, Meriones rex is of some medical and veterinary importance.
-
Mites (acari) infesting commensal rats in Suez Canal zone, Egypt.
Journal of the Egyptian Society of Parasitology, 1995Co-Authors: El Kady Ga, Shoukry A, Ragheb Da, El Said Am, K. S. Habib, Tosson A MorsyAbstract:: Mites are arthropods distinguished from ticks by usually being microscopical in size and have a hypostome unarmed with tooth-like anchoring processes. They are group in a number of suborders, each with super-families and families including many genera of medical and economic importance. In this paper, commensal rodents (Rattus norvegicus, R. r. alexandrinus and R. r. frugivorous) were surveyed in the Suez Canal Zone for their acari ectoparasites. Four species of mites were recovered. In a descending order of mite indices, they were Eulaelaps stabularis (4.83 on 6 rats), Laelaps nuttalli (3.11 on 27 rats), Ornithonyssus bacoti (1.66 on 9 rats) and Dermanyssus gallinae (0.66 on 24 rats). The overall mite indices in the three governorates were 3.66 in Suez, 2.82 in Ismailia and zero in Port Said. The medical and economic importance of the mites were discussed.
-
Interaction between acari ectoparasites and rodents in Suez Governorate, Egypt.
Journal of the Egyptian Society of Parasitology, 1995Co-Authors: Younis Ta, Fayad Me, El Hariry, Tosson A MorsyAbstract:: From the medical point of view, the relation between man and rodents comes in the priority. Some rodent populations are wild but others are commensal and live in close association with man. They steal his food and conveying many zoonotic diseases. Their arthropod ectoparasites play an important role in conveying or transmitting these zoonotic diseases. Several disorders and diseases of man are tick borne relapsing fever, Rocky mountain spotted fever, Lyme disease, and many others. Besides numerous species of mites occasionally infest man. They transmit several diseases as Rickettsia tsutsugamushi fever, epidemic haemorrhagic fever, and they cause severe allergic reaction. The results obtained are summarized in the following (1) Six species and subspecies of rodents were detected. In a descending order of abundance, they were (a) Rattus norvegicus, (b) Rattus rattus alexandrinus (c) Rattus rattus frugivorous (d) Acomys cahirinus (e) Gerbillus gerbillus asyutensis (f) Mus m. praetextus. (2) The most common rodent was R. norvegicus and the least common was M. musculus. (3) The collected ticks and mites were 2 genera of tick larvae; Rhipicephalus species and Hyalomma species. The collected mites were Ornithonyssus bacoti and Laelaps nuttali. (4) Most of the tick larvae were collected from wild rodents; Gerbillus g. asyutensis. (5) Most of the mites were collected from commensal rodents particularly R. norvegicus. Descriptive morphology and illustrations were given to the collected rodents and their acari ectoparasites.
-
Four species of house dust mites recovered from houses of patients with allergic respiratory diseases.
Journal of the Egyptian Society of Parasitology, 1995Co-Authors: Tosson A Morsy, Ragheb Da, Younis Ta, A. M. El Said, M. M. Salama, Arafa Ma, M. M. Abdel RahmanAbstract:: Arthropods and their products are wide spread and considered one of the common allergens affecting man. Allergy to arthropod antigens is the major cause of respiratory allergy as rhinitis and bronchial asthma. The range of reaction depends on several factors which include the type and source of the material, the rate of intensity, the duration of exposure, the human immune response and history of prior exposure. Successful management of allergic disease depends on proper identification of the causative allergen and reduce exposure to this allergen. Generally speaking, the house dust is not a simple substance but an accumulation of living and non living parts as mites, pollens, molds, dander and decaying insects. In the present study, four species of mites were isolated from the dust collected from the houses of patients with allergic respiratory diseases. The species were Dermatophagoides pteronyssinus, D. farinae, Ornithonyssus bacoti and Haemogamassus pontiger. The two species of Dermatophagoides. were the predominant mites which are known to produce the most potent allergies. Studying the serum immunoglobulins level showed that the IgE had a highly significant concentration among respiratory allergic patients (28) with (5) or without (23) atopic dermatitis. It was concluded that house dust mites, that cause inhalant allergens, are one of the main aetiological factors of allergic respiratory diseases, with or without atopic dermatitis.
-
Isolation of three species of mites from house dust of atopic dermatitis patients in Qualyobia Governorate, Egypt
J Egypt Soc Parasitol, 1994Co-Authors: Tosson A Morsy, H W Zohdi, K F Abdalla, A F El Fakahani, A A Ibrahim, H T KhalilAbstract:Dermatitis or inflammation of the skin caused by an outside agent, is a condition with many causes. It may result from direct irritation of the skin by a substances (chemical or insecticide) or it may be an allergic reaction to a particular substance that has been in contact with the skin as soap or detergent or insect urticating hairs; injected as insect saliva or faeces or sting or taken by mouth as food or drug. In general, treatment of dermatitis depends mainly upon the cause. In the present study, three species of mites were isolated from the dust collected from houses of atopic dermatitis patients. These mites were Dermatophagoides pteronyssinus, Ornithonyssus bacoti and Haemogamasus pontiger. The former species was the predominant one which is known to produce the most potent allergen. It was concluded that house dust mites are one of the aetiological factors of atopic dermatitis and that genera of mites other than Dermatophagoides may be considered as allergen in house dust mites.