PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Luz H.R., Faccini J.L.H. & Silva H.R. 2015. Patterns of parasitism by Amblyomma rotundatum (Ixodidae) on Rhinella schneideri (Bufonidae) in islands of São Francisco River, Minas Gerais, Brazil. Pesquisa Veterinária Brasileira 35(6):579-582. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccinijlh@globo.com We sampled ticks from specimens of the rococo toad Rhinella schneideri by flannel dragging on two Islands located in the São Francisco River near the Três Marias hydroelectric dam, southeastern Brazil. A total of 120 toads was examined, of which 63 (52.5%) were parasitized only by Amblyomma rotundatum totaling 96 larvae, 163 nymphs and 134 females. The burden of parasitism ranged from one to 43 ticks, with a mean intensity of infestation of 6.2±5.5 ticks per host. The tick A. rotundatum exhibited highly aggregated distribution. Peak abundance of larvae and nymphs occurred in the dry season (May to September), whereas peak abundance of females occurred in the wet season (October to April). We collected most ticks near the head and hind limbs of R. schneideri. The finding of two engorged A. rotundatum nymphs in the same resting places of two toads and the absence of this species in the dragged areas suggest a nidicolous behavior at the studied site.

• Amblyomma rotundatum Rhinella schneideri

Abstract in Portuguese:

RESUMO.- Luz H.R., Faccini J.L.H. & Silva H.R. 2015. Patterns of parasitism by Amblyomma rotundatum (Ixodidae) on Rhinella schneideri (Bufonidae) in islands of São Francisco River, Minas Gerais, Brazil. [Parasitismo por Amblyomma rotundatum (Ixodidae) em Rhinella schneideri (Bufonidae) em duas ilhas do Rio São Francisco, próximas à represa de Três Marias, Minas Gerais.] Pesquisa Veterinária Brasileira 35(6):579-582. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccinijlh@globo.com Sapos da espécie Rhinella schneideri foram capturados e examinados para coleta das fases parasitárias, assim como arrasto de flanela para coleta das fases de vida livres de carrapatos em duas ilhas localizadas no rio São Francisco , próximas à represa Três Marias, região sudeste do Brasil. No total, 120 indivíduos foram examinados, dos quais 63 (52,5%) estavam parasitados por Amblyomma rotundatum totalizando 96 larvas, 163 ninfas e 134 fêmeas. A abundância do parasitismo variou de 1 a 43 carrapatos, com uma intensidade média de infestação de 6,2±5,5 carrapatos/hospedeiro. A infestação por A. rotundatum apresentou uma distribuição altamente agregada. O pico de abundância de larvas e ninfas ocorreu na estação seca (maio a setembro ), enquanto o pico de abundância de fêmeas ocorreu na estação chuvosa (outubro a abril). A maioria dos carrapatos foi coletada na região da cabeça e membros posteriores. A presença de duas ninfas ingurgitadas de A. rotundatum nos mesmos lugares de descanso de dois sapos e a ausência desta espécie na coleta por arrasto de flanela sugere um comportamento nidicola no local estudado.

Abstract in English:

ABSTRACT.- Tucci E.C., Soares N.M., Faccini J.L.H. & Vilas Boas D. 2014. Additional information about an outbreak by Allopsoroptoides galli (Acari: Psoroptoididae) in commercial laying hens in the state of São Paulo, Brazil. Pesquisa Veterinária Brasileira 34(8):760-762. Laboratório de Parasitologia, Instituto Biológico, Av. Conselheiro Rodrigues Alves 1252, São Paulo, SP 04014-002, Brazil. E-mail: tucci@biologico.sp.gov.br This paper reports additional information about a mange outbreak by the mite Allopsoroptoides galli in a commercial egg-laying hen facility in the state of São Paulo, Brazil. About half of the 76,000 multi-age birds of the flock were affected. Experimental infestations carried out on naive hens resulted in clinical signs similar to those diagnosed in naturally infested hens, such as generalized scaly dermatitis, presence of mucus-like material and yellowish crusts on the skin and around the calami, feather loss and strong unpleasant odor. About 30% drop of egg production was estimated. The possible source of infestation were wild birds identified on the ground and roofs of the sheds.

• Mange Allopsoroptoides galli Acari dermatitis sarna dermatite

Abstract in Portuguese:

RESUMO.- Tucci E.C., Soares N.M., Faccini J.L.H. & Vilas Boas D. 2014. Additional information about an outbreak by Allopsoroptoides galli (Acari: Psoroptoididae) in commercial laying hens in the state of São Paulo, Brazil. [Informação adicional sobre um surto de sarna causado por Allopsoroptoides galli (Acari: Psoroptoididae) em uma granja de poedeiras no Estado de São Paulo.] Pesquisa Veterinária Brasileira 34(8):760-762. Laboratório de Parasitologia, Instituto Biológico, Av. Conselheiro Rodrigues Alves 1252, São Paulo, SP 04014-002, Brazil. E-mail: tucci@biologico.sp.gov.br Este artigo acrescenta informações adicionais sobre um surto de sarna causado por Allopsoroptoides galli em uma instalação comercial de galinhas de postura no estado de São Paulo, Brasil. Approximadamente metade das 76.000 aves, com várias idades, mantidas em uma granja, foram infestadas. Um total de 12 galinhas sem prévio contato com os ácaros e infestadas experimentalmente apresentaram sinais clínicos semelhantes aos diagnosticados em galinhas naturalmente infestadas, tais como dermatite escamosa generalizada, presença de material mucoso, crostas amareladas na pele e em torno dos câlamos, perda de penas e forte odor desagradável. A perda na produçãode ovos foi estimada em 30%. As possíveis fontes de infestação foram aves silvestres observadas no chão próximo aos galpões e telhados.

Abstract in English:

ABSTRACT.- Cunha V.E.S., Silva M.H. & Faccini J.L.H. 2012. Serological identification of house dust mite allergens in dogs with atopic dermatitis. Pesquisa Veterinária Brasileira 32(9):917-921. Departamento de Parasitologia Veterinária, Universidade Federal Rural do Rio de Janeiro, BR 465 Km 7, Seropédica, RJ 23890-000, Brazil. E-mail: mv.victor@uol.com.br House dust mite antigens have been used for decades to diagnose allergic diseases in humans and animals. The objective of this study was to identify allergens in commercial Dermatophagoides farinae and Blomia tropicalis extracts by immunoblotting using sera from allergic dogs and anti-dog IgE conjugate. The analysis of antigens present in the D. farinae extract (FDA Allergenic) using sera from 10 dogs allergic to D. farinae showed that eight sera recognized a band of approximately 102 kDa, eight recognized two bands of 52 to 76 kDa, five recognized one band of approximately 76 kDa, four recognized one band of 31 to 38 kDa, and two recognized one band of 12 to 17 kDa. Immunoblot assays of the B. tropicalis extract (FDA Allergenic) using sera from 10 animals allergic to B. tropicalis showed that five sera recognized two bands of 52 to 76 kDa. These results demonstrate the importance of the two house dust mite species for the pathogenesis of canine atopic dermatitis in Brazil. In addition, the results indicate which allergens should be present in allergenic extracts used for diagnosis and allergen-specific immunotherapy.

• House dust mite dermatitis allergens ácaros da poeira domiciliar dermatite atópica alérgenos

Abstract in Portuguese:

RESUMO.- Cunha V.E.S., Silva M.H. & Faccini J.L.H. 2012. Serological identification of house dust mite allergens in dogs with atopic dermatitis. Pesquisa Veterinária Brasileira 32(9):917-921. Departamento de Parasitologia Veterinária, Universidade Federal Rural do Rio de Janeiro, BR 465 Km 7, Seropédica, RJ 23890-000, Brazil. E-mail: mv.victor@uol.com.br Antígenos de ácaros da poeira domiciliar são utilizados por décadas para diagnóstico de doenças alérgicas em seres humanos e animais. O objetivo do presente trabalho foi identificar proteínas alergênicas presentes em extratos de Dermatophagoides farinae e Blomia tropicalis através de “immunoblotting” utilizando-se soros de animais alérgicos e conjugado anti-IgE canina. A análise por “immunoblotting” dos antígenos presentes no extrato de D. farinae (FDA Allergenic), utilizando soros de dez animais alérgicos, mostrou que oito soros reconhecem uma banda com peso molecular de aproximadamente 102 kDa; oito soros duas bandas entre 52 e 76 kDa; cinco soros uma banda com aproximadamente 76 kDa; quatro soros uma banda entre 31 e 38 kDa; e dois soros uma banda entre 12 e 17 kDa. A análise por “immunoblotting” dos antígenos do extrato de B. tropicalis (FDA Allergenic) mostrou que cinco soros reconhecem duas bandas com pesos moleculares entre 52 e 76 kDa. Esses resultados demonstram a importância dessas duas espécies de ácaros da poeira domiciliar na patogênese da dermatite atópica canina no Brasil, assim como indicam alérgenos que devem estar presentes nos extratos alergênicos utilizados para diagnóstico e imunoterapia alérgeno-específica.

Abstract in English:

ABSTRACT.- Santos S.B., Nascimento E.R., Faccini J.L.H., Barreto M.L. & Mota R.A. 2012. [Mycoplasmas species associated with the ear mites in cattle.] Associação entre Mycoplasma spp. e ácaros do conduto auditivo de bovinos. Pesquisa Veterinária Brasileira 32(4):293-296. Laboratório de Bacterioses dos Animais Domésticos, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros s/n, Recife, PE 52171-900, Brazil. E-mail: sanbsantos@gmail.com This study was carried out to assess the association between of mycoplasmas species with ear mites Raillietia auris and R. flechtmanni in the external ear canal of 60 bovines at slaughter time from the State of Rio de Janeiro, Brazil. Steril syringes (60ml) loaded with buffer solution (PBS, pH 7.2) were used for the ear canal flushing. Were processed 218 mites for mycoplasma isolation. A pool of mites from each sampled bovine was washed five times sucessively in 1mL of liquid modified Hayflick´s medium. The washed mites obtained were diluted up to 10-1 at 10-5, inoculated in liquid and solid Hayflick´s media and incubated at 37oC for 2-3 days, being the plates put into jar for the obtention of microaerofilia condition. The Typical colonies were typified by the indirect imunoperoxidase test (IPI) with paper discs satured with hyperimmune rabbit sera. In the studied bovine high prevalence was verified Raillietia spp. 76.7% (46/60). The parasitism by mycoplasmas and mites was verified in 40 animals (74.1%), this association was significant (p<0.001). Among the mites processed for isolation mycoplasmas 193 were female and 25 males. The frequency of Mycoplasma in Raillietia spp. was of 81.2% (177/218) (p<0.001). Of the females identified 52.3% (101/193) were R. auris and 47.7% (92/193) were R. flechtmanni. The frequency of Mycoplasma in the females of R. auris was of 75.2% (76/101) and 88% (81/92) in R. flechtmanni (P<0.05). The mycoplasmas species typified by IPI in the Raillietia auris mites were M. alkalescens 6.9%, M. arginini 3.4%, M. bovirhinis 9.2%, M. conjunctivae 18.4%, M. mycoides mycoides LC 8.0%, M. capricolum 5.7%. In the R. flechtmanni mites mycoplasmas species typified were M. alkalescens 12.2%, M. arginini 1.0%, M. bovirhinis 18.9%, M. bovis 2.2%, M. conjunctivae 21.0%, M. mycoides mycoides LC 11.0% e M. capricolum 4.4%. The species of identified mycoplasmas in the external ear canal bovine and mites were exactly the same. The results confirm that the external ear canal cattle’s ear canal is also a mycoplasmas source, including potentially pathogenic species for cattle, and these mollicutes are closely related with mites Raillietia spp. that is carrier and this agent in your organism.

• Mycoplasma spp ear mites Gamasida ácaros Gamasida

Abstract in Portuguese:

RESUMO.- Santos S.B., Nascimento E.R., Faccini J.L.H., Barreto M.L. & Mota R.A. 2012. [Mycoplasmas species associated with the ear mites in cattle.] Associação entre Mycoplasma spp. e ácaros do conduto auditivo de bovinos. Pesquisa Veterinária Brasileira 32(4):293-296. Laboratório de Bacterioses dos Animais Domésticos, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros s/n, Recife, PE 52171-900, Brazil. E-mail: sanbsantos@gmail.com Esse estudo foi realizado com o objetivo de verificar a associação entre micoplasmas e ácaros (Raillietia auris e R. flechtmanni) no conduto auditivo de bovinos. Foram realizadas lavagens no conduto auditivo externo de 60 bovinos abatidos no Estado do Rio de Janeiro, Brasil. Para a lavagem dos condutos auditivos foi utilizada solução salina tamponada (PBS, pH 7.2) em seringas estéreis de 60mL. Para o isolamento de micoplasmas foram utilizados pools de ácaros por animal, lavados sucessivamente em 1mL de meio Hayflick modificado. Os lavados dos ácaros foram diluídos de 10-1 até 10-5 e repicados em meio Hayflick modificado, sólido e líquido e incubados a 37°C por 48-72 horas em microaerofilia. A identificação das espécies de micoplasmas foi realizada pelo teste da imunoperoxidase indireta (IPI). Verificou-se alta prevalência de ácaros do gênero Raillietia spp. 76,7% (46/60). O parasitismo por ácaros e micoplasmas foi verificado em 40 animais (74,1%), sendo esta associação significativa (p<0,001). Dos ácaros processados para isolamento de micoplasmas, 193 foram fêmeas e 25 machos. A frequência de Mycoplasma em Raillietia spp. foi de 81,2% (177/218) (p<0.001). Das fêmeas identificadas, 52,3% (101/193) foram R. auris e 47,7% (92/193) R. flechtmanni. A frequência de Mycoplasma nas fêmeas de R. auris foi de 75,2% (76/101) e na espécie R. flechtmanni foi de 88% (81/92) (P<0.05). As espécies de micoplasmas tipificadas pela IPI nos ácaros Raillietia auris foram: M. alkalescens 6,9%, M. arginini 3,4%, M. bovirhinis 9,2%, M. conjunctivae 18,4%, M. mycoides mycoides LC 8,0%, M. capricolum 5,7%. Em R. flechtmanni as espécies de micoplasmas identificadas foram: M. alkalescens 12,2%, M. arginini 1,0%, M. bovirhinis 18,9%, M. bovis 2,2%, M. conjunctivae 21,0%, M. mycoides mycoides LC 11,0% e M. capricolum 4,4%. As espécies de micoplasmas identificadas no conduto auditivo externo dos bovinos foram as mesmas presentes nos ácaros R. auris e R. flechtmanni. Os resultados confirmam que o conduto auditivo externo de bovinos é um habitat de Mycoplasma spp., incluindo espécies potencialmente patogênicas para os rebanhos, além dos ácaros R. auris e R. flechtmanni estarem associados com esses molicutes carreando-os em seu organismo.

Abstract in English:

ABSTRACT.- Ferry F.R.A., Faccini J.L.H. & Inada T. 2011. The role of ear mites of the genus Raillietia (Acari: Raillietiidae) in otitis of domestic ruminants. Pesquisa Veterinária Brasileira 31(11):981-984. Departamento de Medicina Geral, Universidade Federal do Estado do Rio de Janeiro, EMC/CCBS, Hospital Universitário Gaffrée e Guinle, Rua Mariz e Barros 775, Tijuca, Rio de Janeiro, RJ 20270-004, Brazil. E-mail: fernandoferry@hotmail.com This paper presents a hypothesis on the involvement of species of the genus Raillietia Trouessart in the pathology of parasitic otitis in domestic ruminants. The chelicerae and claws of the tarsi are structures that contribute significantly towards producing primary lesions. The movable digits of the chelicerae accidentally injure the epithelium that lines the ear canal, while the claws of the tarsi perforate the epithelium, allowing the mites to affix themselves while feeding. The lesions in the epithelium caused by the chelicerae and the claws favor multiplication of the bacteria that inhabit the ear canal, resulting in typical cases of otitis.

• Raillietiidae Raillietia otitis otite

Abstract in Portuguese:

RESUMO.- Ferry F.R.A., Faccini J.L.H. & Inada T. 2011. The role of ear mites of the genus Raillietia (Acari: Raillietiidae) in otitis of domestic ruminants. [O papel dos ácaros do gênero Raillietia (Acari: Raillietiidae) na otite de ruminantes domésticos.] Pesquisa Veterinária Brasileira 31(11):981-984. Departamento de Medicina Geral, Universidade Federal do Estado do Rio de Janeiro, EMC/CCBS, Hospital Universitário Gaffrée e Guinle, Rua Mariz e Barros 775, Tijuca, Rio de Janeiro, RJ 20270-004, Brazil. E-mail: fernandoferry@hotmail.com Neste trabalho apresentamos uma hipótese para explicar o envolvimento dos ácaros do gênero Raillietia na patogênese da otite parasitária em ruminantes domésticos. As quelíceras e unhas dos tarsos são estruturas que contribuem significativamente para produzir as lesões primárias no epitélio. Os dígitos móveis das quelíceras acidentalmente causam injúria no epitélio que reveste o canal auditivo, enquanto as unhas dos tarsos perfuram o epitélio para permitir a fixação dos ácaros durante sua alimentação. As lesões no epitélio causadas pelas quelíceras e unhas dos tarsos favorecem a multiplicação das bactérias que habitam o canal auditivo, resultando em casos típicos de otite.

Abstract in English:

ABSTRACT.- Santos S.B., Nascimento E.R., Faccini J.L.H., Barreto M.L., Almeida J.F., Pereira V.L.A. & Campos C.A.M. 2010. [Detection of Mycoplasma mycoides cluster by indirect immunoperoxidase (IPI) and PCR-REA in the ear canal of bovines.] Detecção do Grupo Mycoplasma mycoides por imunoperoxidase indireta (IPI) e PCR-REA em conduto auditivo de bovinos. Pesquisa Veterinária Brasileira 30(5):465-469. Departamento de Saúde Coletiva Veterinária e Saúde Pública, Universidade Federal Fluminense, Rua Vital Brazil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: elmiro@vm.uff.br Mycoplasma mycoides cluster (MMC) was diagnosed by polimerase chain reaction-restriction endonuclease analysis (PCR-REA) and indirect immunoperoxidase (IPI), both, carried out in flushing from external ear canal, collected from bovine at slaughter time in the State of Rio de Janeiro, southeastern, Brazil. A total of 60 bovines were randomly selected. Sterile syringes (60mL) loaded with buffer solution (PBS, pH 7.2) were used for the ear canal flushing. The obtained samples were stored in glycerol (1:2) and frozen at -20oC until use. These specimens were diluted up to 10-5, inoculated in liquid and solid modified Hayflick´s media and incubated at 37oC for 2-3 days. The plates were kept in a microaerophilia condition and examined every two days under a stereomicroscope for the presence of typical colonies “fried-egg”. In this study, 35 strains selected in agreement with their biochemistry and physiologic proprieties, were used. From the 60 cultivated samples, 48 (80.00%) were positive for Mycoplasma spp. Under IPI the prevalence obtained for MMC was 20.0% (12/60) while by PCR-REA it was 41.7% (25/60). The IPI typing of these isolates resulted in 58.3% (7/12) for M.mycoides mycoides LC and 41.7% (5/12) for M. capricolum. PCR-REA for MMC was confirmed by the amplicon size of 785bp, compatible with this group. The Kappa value for the association between these two tests was 0.14 (p>0.05). After restriction analysis with AluI in all MMC strains the fragments size obtained were of 81, 98, 186 and 236bp, but not of 370bp that is compatible with Mycoides mycoides mycoides SC of bovine type. The presence of mycoplasmas species in the ear canal of asymptomatic bovines represent a risk of subsequent propagation of Mycoplasma spp. among bovine herds in Brazil.

• Mycoplasma mycoides

Abstract in Portuguese:

RESUMO.- Santos S.B., Nascimento E.R., Faccini J.L.H., Barreto M.L., Almeida J.F., Pereira V.L.A. & Campos C.A.M. 2010. [Detection of Mycoplasma mycoides cluster by indirect immunoperoxidase (IPI) and PCR-REA in the ear canal of bovines.] Detecção do Grupo Mycoplasma mycoides por imunoperoxidase indireta (IPI) e PCR-REA em conduto auditivo de bovinos. Pesquisa Veterinária Brasileira 30(5):465-469. Departamento de Saúde Coletiva Veterinária e Saúde Pública, Universidade Federal Fluminense, Rua Vital Brazil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: elmiro@vm.uff.br O Grupo Mycoplasma mycoides (GMM) foi diagnosticado por PCR-REA e imunoperoxidase indireta (IPI) em amostras de lavados de conduto auditivo de bovinos no Estado do Rio de Janeiro, Brasil. 60 bovinos foram selecionados aleatoriamente. As lavagens foram feitas com uso de seringas estéreis contendo um volume de 60 mL de solução salina tamponada (PBS pH 7.2). As amostras obtidas foram estocadas em glicerol (1:2) e congeladas a -20oC até uso. Estas amostras foram diluídas até 10-5 e repicadas em meio Hayflick modificado, sólido e líquido, sendo incubados a 37oC por 48-72 horas. As placas foram mantidas em microaerofilia e observadas diariamente, para visualização das colônias típicas em “ovo-frito”. Das 60 amostras cultivadas, 48 (80,00%) foram positivas para Mycoplasma spp. A prevalência obtida para o GMM na IPI foi de 20,0% (12/60) enquanto na PCR-REA foi de 41,7% (25/60). Das cepas tipificadas pela IPI 58,3% (7/12) foram M. mycoides subsp. mycoides LC e 41,7% (5/12) foram M. capricolum. Na PCR-REA o grupo M. mycoides foi confirmado pela visualização de um amplicon de 785bp, compatível com este grupo. O valor encontrado no teste Kappa para associação entre estes testes foi de 0,14 (P>0,05. Na clivagem do produto da PCR com a enzima de restrição AluI, de cepas de referências e dos isolados de ouvido os fragmentos obtidos foram de 81, 98, 186 e 236pb, mas não de 370pb, que é específica para o agente da Pleuropneumonia Contagiosa Bovina. A presença de espécies de micoplasmas no conduto auditivo de bovinos assintomáticos representa um risco para propagação de Mycoplasma spp. entre rebanhos bovinos no Brasil.

Abstract in English:

ABSTRACT.- Cunha V.E. S., Hahnstadt R.L., Soares A.M.B. & Faccini J.L.H. 2007. Evaluation of skin sensitivity in dogs bearing allergic dermatitis to standardized allergenic extracts of house dust mites. Pesquisa Veterinária Brasileira 27(8):341-344. Curso de Pós-Graduação em Ciência Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil E-mail: mvvictor@ufrrj.br The objective of the study was to evaluate whether allergenic extracts of five house dust and storage mite species standardized for humans might be used for the diagnosis of canine atopic dermatitis (CAD). Extracts of Dermatophagoides pteronyssinus (Pyroglyphidae), D. farinae (Pyroglyphidae), Blomia tropicalis (Glycyphagidae), Lepidoglyphus destructor (Glycyphagidae) and Tyrophagus putrescentiae (Acaridae) were evaluated by intradermal testing in 20 healthy dogs (control) and 25 dogs with allergic dermatitis. A significant difference in the response was observed between the two groups (p<0.05). Only one dog (5%) in the control group reacted to the intradermal test, whereas 14 dogs (56%) in the allergic group were positive for at least one extract (odds ratio = 24.2). Most of the positive reactions observed in the allergic group occurred against the extracts of T. putrescentiae or L. destructor, each inducing reactions in 10 dogs (40%). D. farinae, D. pteronyssinus e B. tropicalis extracts induced reactions in 7 (28%), 3 (12%) and 3 (12%) dogs, respectively. The allergenic extracts standardized for humans evaluated in the present study may be used as a tool to complement the diagnosis of the disease, as well as to select potential allergen candidates for allergen-specific immunotherapy.

• Dust mites allergy canine atopic dermatitis intradermal test

Abstract in Portuguese:

ABSTRACT.- Cunha V.E. S., Hahnstadt R.L., Soares A.M.B. & Faccini J.L.H. 2007. Evaluation of skin sensitivity in dogs bearing allergic dermatitis to standardized allergenic extracts of house dust mites. Pesquisa Veterinária Brasileira 27(8):341-344. Curso de Pós-Graduação em Ciência Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil E-mail: mvvictor@ufrrj.br The objective of the study was to evaluate whether allergenic extracts of five house dust and storage mite species standardized for humans might be used for the diagnosis of canine atopic dermatitis (CAD). Extracts of Dermatophagoides pteronyssinus (Pyroglyphidae), D. farinae (Pyroglyphidae), Blomia tropicalis (Glycyphagidae), Lepidoglyphus destructor (Glycyphagidae) and Tyrophagus putrescentiae (Acaridae) were evaluated by intradermal testing in 20 healthy dogs (control) and 25 dogs with allergic dermatitis. A significant difference in the response was observed between the two groups (p<0.05). Only one dog (5%) in the control group reacted to the intradermal test, whereas 14 dogs (56%) in the allergic group were positive for at least one extract (odds ratio = 24.2). Most of the positive reactions observed in the allergic group occurred against the extracts of T. putrescentiae or L. destructor, each inducing reactions in 10 dogs (40%). D. farinae, D. pteronyssinus e B. tropicalis extracts induced reactions in 7 (28%), 3 (12%) and 3 (12%) dogs, respectively. The allergenic extracts standardized for humans evaluated in the present study may be used as a tool to complement the diagnosis of the disease, as well as to select potential allergen candidates for allergen-specific immunotherapy.

Abstract in English:

ABSTRACT.- Santos S.B., Faccini J.L.H. & Santos A.C.G. 2006. [Seasonal variation of Bovicola caprae parasitizing goats in the State of Paraíba, northeastern Brazil.] Variação estacional de Bovicola caprae parasitando caprinos no Estado da Paraíba. Pesquisa Veterinária Brasileira 26(4):249-253. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br The effects of temperature, humidity and rainfall on field population trend of the biting louse Bovicola caprae, parasitizing goats bred in the semiarid region of the State of Paraiba, northeastern Brazil were monthly evaluated from August 1999 to July 2002. In the first two years (August 1999 to July 2001) 30 goats were examined, whereas 16 goats were examined in the last year (August 2001 to July 2002). All goats were crossbred, both sexes and abated for human consumption. The lice were collected in an area 4cm of diameter at three body sites: maxillary, back line and haunch. Spearman correlation analysis was conducted (p< 0.05) between monthly average intensity of infestation of all stages (egg, larva, nymph, male and female) of the life cycle pooled and monthly total counts of each stage and mean temperature, mean relative humidity and rainfall. B. caprae was found throughout the year with prevalence of 75-100%. Increase of the louse population during the drier months was probably a consequence of poor nutrition due to reduced pasture and inadequate husbandry practices instead the influence of abiotic factors.

• Bovicola caprae Trichodectidae Mallophaga seasonal variation goats northeastern Brazil

Abstract in Portuguese:

ABSTRACT.- Santos S.B., Faccini J.L.H. & Santos A.C.G. 2006. [Seasonal variation of Bovicola caprae parasitizing goats in the State of Paraíba, northeastern Brazil.] Variação estacional de Bovicola caprae parasitando caprinos no Estado da Paraíba. Pesquisa Veterinária Brasileira 26(4):249-253. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br The effects of temperature, humidity and rainfall on field population trend of the biting louse Bovicola caprae, parasitizing goats bred in the semiarid region of the State of Paraiba, northeastern Brazil were monthly evaluated from August 1999 to July 2002. In the first two years (August 1999 to July 2001) 30 goats were examined, whereas 16 goats were examined in the last year (August 2001 to July 2002). All goats were crossbred, both sexes and abated for human consumption. The lice were collected in an area 4cm of diameter at three body sites: maxillary, back line and haunch. Spearman correlation analysis was conducted (p< 0.05) between monthly average intensity of infestation of all stages (egg, larva, nymph, male and female) of the life cycle pooled and monthly total counts of each stage and mean temperature, mean relative humidity and rainfall. B. caprae was found throughout the year with prevalence of 75-100%. Increase of the louse population during the drier months was probably a consequence of poor nutrition due to reduced pasture and inadequate husbandry practices instead the influence of abiotic factors.

Abstract in English:

Tancredi M.G.F., Faccini J.L.H., Tancredi I.P., Martins I.V.F. & Scott F.B. 2005. [The host-relationship between Psoroptes equi and horses.] Relação parasito-hospedeiro entre Psoroptes equi e eqüinos. Pesquisa Veterinária Brasileira 25(4):207-209. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br Horses, abandoned by their owners (stray horses) along the main roads in the state of Rio de Janeiro, southeastern Brazil, and brought by the Federal Police to a quarantine station at the Universidade Federal Rural do Rio de Janeiro, were included in the study. A total of 1,121 horses were examined from November 1998 to November 2000. Skin scrapings from 107 (9.5%) horses with signs of psoroptic mange resulted in 37 (34.6%) positive animals for Psoroptes equi. There was no statistical correlation between prevalence and host age or sex (c2, p>0,05). P. equi was diagnosed in animals with different hair color. The dorsal region (withers to hip) was the most affected area of the body.

• Psoroptes equi Acari Psoroptidae mange horses Brazil.

Abstract in Portuguese:

Tancredi M.G.F., Faccini J.L.H., Tancredi I.P., Martins I.V.F. & Scott F.B. 2005. [The host-relationship between Psoroptes equi and horses.] Relação parasito-hospedeiro entre Psoroptes equi e eqüinos. Pesquisa Veterinária Brasileira 25(4):207-209. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br Horses, abandoned by their owners (stray horses) along the main roads in the state of Rio de Janeiro, southeastern Brazil, and brought by the Federal Police to a quarantine station at the Universidade Federal Rural do Rio de Janeiro, were included in the study. A total of 1,121 horses were examined from November 1998 to November 2000. Skin scrapings from 107 (9.5%) horses with signs of psoroptic mange resulted in 37 (34.6%) positive animals for Psoroptes equi. There was no statistical correlation between prevalence and host age or sex (c2, p>0,05). P. equi was diagnosed in animals with different hair color. The dorsal region (withers to hip) was the most affected area of the body.

Abstract in English:

Faccini J.L.H., Santos A.C.G. & Bechara G.H. 2004. [Bovine demodicosis in the state of Paraíba, northeastern Brazil.] Demodicose bovina no Estado da Paraíba. Pesquisa Veterinária Brasileira 24(3):149-152. Depto Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br Cases of bovine demodicosis caused by Demodex bovis were reported in a Sindhi herd from December 1989 to January 1992. Both localized and generalized forms were diagnosed. This is the first report of the generalized form in Brazil. In the first two years, demodicosis was diagnosed only in cattle < 2 years old, whereas animals of all ages were positive in the last two years. Prevalence varied from 20.4% (11/54) to 53.1% (26/49) and 13.2% (12/91) to 14.8% (9/61) for cattle < 2 years old and > 2 years old, respectively. Clinical signs varied from a few small nodules to a thickened skin with soft large nodules in the localized and generalized forms, respectively. Main microscopic features of the nodules in the generalized form consisted of acanthosis with hyperqueratosis, chronic sebaceous adenitis, subcutaneous muscular necrosis, focal cellular degeneration of the epidermis basal layer and presence of large number of mites inside the lumen of dilated hair follicles. In addition, a chronic perifoliculitis was observed, characterized by lymphoplasmocytic infiltrate which also contained macrophages and neutrophils. It is suggested that poor nutrition and stress due to prolonged drought probably contributed to the increase of susceptibility of the herd to mite infestation.

• Demodex bovis demodicosis cattle pathology Brazil.

Abstract in Portuguese:

Faccini J.L.H., Santos A.C.G. & Bechara G.H. 2004. [Bovine demodicosis in the state of Paraíba, northeastern Brazil.] Demodicose bovina no Estado da Paraíba. Pesquisa Veterinária Brasileira 24(3):149-152. Depto Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: faccini@ufrrj.br Cases of bovine demodicosis caused by Demodex bovis were reported in a Sindhi herd from December 1989 to January 1992. Both localized and generalized forms were diagnosed. This is the first report of the generalized form in Brazil. In the first two years, demodicosis was diagnosed only in cattle < 2 years old, whereas animals of all ages were positive in the last two years. Prevalence varied from 20.4% (11/54) to 53.1% (26/49) and 13.2% (12/91) to 14.8% (9/61) for cattle < 2 years old and > 2 years old, respectively. Clinical signs varied from a few small nodules to a thickened skin with soft large nodules in the localized and generalized forms, respectively. Main microscopic features of the nodules in the generalized form consisted of acanthosis with hyperqueratosis, chronic sebaceous adenitis, subcutaneous muscular necrosis, focal cellular degeneration of the epidermis basal layer and presence of large number of mites inside the lumen of dilated hair follicles. In addition, a chronic perifoliculitis was observed, characterized by lymphoplasmocytic infiltrate which also contained macrophages and neutrophils. It is suggested that poor nutrition and stress due to prolonged drought probably contributed to the increase of susceptibility of the herd to mite infestation.