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1.
Rev. Soc. Bras. Med. Trop ; 50(6): 788-794, Nov.-Dec. 2017. tab, graf
Article in English | LILACS | ID: biblio-897029

ABSTRACT

Abstract INTRODUCTION: The production of the Montenegro antigen for skin test poses difficulties regarding quality control. Here, we propose that certain animal models reproducing a similar immune response to humans may be used in the quality control of Montenegro antigen production. METHODS: Fifteen Cavia porcellus (guinea pigs) were immunized with Leishmania amazonensis or Leishmania braziliensis , and, after 30 days, they were skin tested with standard Montenegro antigen. To validate C. porcellus as an animal model for skin tests, eighteen Mesocricetus auratus (hamsters) were infected with L. amazonensis or L. braziliensis , and, after 45 days, they were skin tested with standard Montenegro antigen. RESULTS: Cavia porcellus immunized with L. amazonensis or L. braziliensis , and hamsters infected with the same species presented induration reactions when skin tested with standard Montenegro antigen 48-72h after the test. CONCLUSIONS: The comparison between immunization methods and immune response from the two animal species validated C. porcellus as a good model for Montenegro skin test, and the model showed strong potential as an in vivo model in the quality control of the production of Montenegro antigen.


Subject(s)
Animals , Male , Leishmania braziliensis/immunology , Intradermal Tests/standards , Leishmaniasis, Cutaneous/diagnosis , Models, Animal , Antigens, Protozoan/biosynthesis , Antigens, Protozoan/immunology , Quality Control , Predictive Value of Tests , Sensitivity and Specificity , Leishmania/immunology
2.
Rev. Soc. Bras. Med. Trop ; 36(2): 249-251, mar.-abr. 2003. tab
Article in Portuguese | LILACS | ID: lil-340904

ABSTRACT

Para avaliar a resposta a sucessivas aplicaçöes da intradermorreaçäo de Montenegro (IDRM), repetimos quatro vezes o teste em moradores de uma área endêmica de calazar que tiveram o exame negativo há 3-4 anos. Inicialmente, repetimos três IDRM nos que permaneceram negativos, com intervalo de 60 dias entre elas. Na segunda etapa, realizamos uma última reaçäo em todos participantes do estudo. Do total de 49 indivíduos com IDRM prévia negativa, 19 (38,8 por cento) positivaram o teste em alguma das vezes, 17 (34,7 por cento) abandonaram o estudo e 13 (26,5 por cento) permaneceram com resultado negativo em todas as aplicaçöes. Na segunda etapa, a repetiçäo da IDRM mostrou que dos 14 que eram positivos em algum dos testes, 8 assim permaneceram e 6 tornaram-se negativos. Nossos resultados confirmam a possibilidade de induçäo de hipersensibilidade tardia em alguns indivíduos pela aplicaçäo da IDRM


Subject(s)
Animals , Humans , Hypersensitivity, Delayed/immunology , Intradermal Tests/standards , Leishmania/immunology , Leishmaniasis, Visceral/diagnosis , Antigens, Protozoan/immunology , Brazil/epidemiology , Cross-Sectional Studies , Enzyme-Linked Immunosorbent Assay , False Negative Reactions , Leishmaniasis, Visceral/epidemiology , Leishmaniasis, Visceral/immunology
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