979 resultados para modified agglutination test (MAT)


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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Infection by Toxoplasma gondii in equines is usually not apparent, it being characterized by presence of antibody titers and tissue cysts. This study was aimed at verifying the presence of anti-Toxoplasma antibodies in equine serum by modified agglutination test (MAT) and reaction to indirect immunofluorescent antibody test (IFAT). 1984 samples of serum were examined, by MAT, using whole formalin fixed tachyzoites of T.gondii as antigen. The samples reacting in the MAT test, and 150 other negative samples, chosen at random, were also tested by IFAT, utilizing anti-equine IgG. The association among the test results was verified by the McNemar test. 138 samples were positive in the MAT test, with 60 (46.38%) presenting reaction at a dilution of 1:64; 52 (37.7%) at 1:256; 19 (13.8%) at 1:1024; five (3.6%) at 1:4096; and two (1.45%) at 1:16384. Of 132 positive MAT samples, 14 were negative in the IFAT test, but the statistical analysis indicated general agreement in results of the tests. The results obtained showed agreement among the tests utilized, and the possibility of participation of equines in the transmission of toxoplasmosis to carnivorous animals, and also to humans.

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Goats are economically important in many countries, and little is known of caprine toxoplasmosis in Brazil. Antibodies to Toxoplasma gondii were assayed in the sera of 143 goats from 3 Brazilian states, using modified agglutination test (MAT titer ≥1:25); 46 (32.2%) tested positive. Samples of brain, heart, diaphragm, and masseter of seropositive animals were pooled, digested in pepsin, and bioassayed in mice. Viable T. gondii specimens were isolated from tissue homogenates of 12 goats; the isolates were designated TgGtBr1-12. Ten of the 12 isolates killed 100 of infected mice, indicating that goats can harbor mouse-virulent T. gondii and, hence, can serve as a source of infection for humans. © 2009 American Society of Parasitologists.

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Toxoplasma gondii is the causative intracellular protozoan of toxoplasmosis in human being and animals. Members of the Felidae family are considered the single definitive host for the infection; both wild and domestic cats are able to excrete oocysts in the environment. Wild cats maintained in captivity may serve as source of infection for other clinically susceptible animals in the same environment. The aim of this study was to determine the frequency of T. gondii IgG antibodies in 57 neotropical felids (1 Leopardus geoffroyi; 3 Puma yagouaroundi; 17 Leopardus wiedii; 22 Leopardus tigrinus; and 14 Leopardus pardalis) kept at the Bela Vista Biological Sanctuary, Itaipu Binacional, Southern Brazil, by the modified agglutination test (MAT) using titer 16 as cut-off point. Seropositivity was observed in 38/57 (66.67%; 95% CI 53.66-77.51%) samples, with higher frequency in ocelots (71.43%). Wild-caught felids were three times more likely to be infected when compared to zoo-born animals (P≤ 0.05) and age of wild-caught animals (P= 0.6892; 95% CI. = 0.7528-1.66) was not significant as a risk factor for the infection, the same occurring with zoo-born animals (P= 0.05; 95% CI. = 0.6267-24.052). These results suggest that, despite efforts to control T. gondii infection in zoo facilities, such as individual pens, hygiene monitoring, veterinary care and pre-frozen meat offered as food, non-domestic felids kept in captivity, particularly the wild-caught specimens, may be invariably exposed to infection due to other environmental sources. © 2010 Elsevier B.V.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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A toxoplasmose é uma zoonose causada pelo Toxoplasma gondii, comum nos animais domésticos e que tem sido objeto de estudos no Brasil e em todas as partes do mundo. Este parasita intracelular obrigatório infecta mamíferos e aves e tem nos felídeos seus hospedeiros definitivos. Nas aves, a infecção toxoplásmica pode ser assintomática, a forma mais provável de contaminação é através da ingestão de oocistos presentes no solo, água e rações contaminadas e a carne de frangos uma das principais vias de transmissão para o homem. Com objetivo de estudar a ocorrência de anticorpos anti-Toxoplasma gondii em frangos de corte abatidos para consumo na região metropolitana de Belém, 300 amostras de soro procedentes de abate em escala industrial e clandestino, foram submetidas ao Teste de Aglutinação Modificada (MAT). Anticorpos anti-T. gondii foram detectados em uma (1/300, 0,33%) amostra, procedente de abate clandestino e em nenhuma amostra procedente de abate em escala industrial. Embora as amostras de soro de frangos de corte procedentes de abate em escala industrial não tenham demonstrado anticorpos anti-T. gondii, recomenda-se a adoção rotineira de pesquisa sorológica desse organismo em qualquer tipo de abate e no nível de consumo como medida de prevenção ao risco sanitário humano e estudos para determinar a real importância das galinhas de criação livre na epidemiologia da toxoplasmose em nosso meio.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)