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In April 1998 urine samples from adult female buffaloes were collected in a farm located in Registro, Vale do Ribeira, São Paulo State, Brazil. The urine samples obtained after furosemide injection were immediately transported to the laboratory in liquid modified EMJH medium and seeded, by the serial dilution technique, into Fletcher's or modified EMJH-0.2% agar, both of them with 5-fluorouracil 100mg/mL. The intraperitoneoum inoculation of 0.5 mL was also performed with each urine sample in young, adult hamsters (Mesocricetus auratus). All samples seeded directly in culture medium were contaminated. The hamsters did not show any sign of disease and were killed at the 21st post inoculation day. At this time kidney cultures of these animals were performed and from one of them, one leptospira strain (M04-98) was isolated, identified as belonging to serogroup Sejroe by Microscopic Agglutination Test (MAT) with a panel of 36 rabbit sera against serovars representative for the pathogenic serogroups. Subsequently, MAT was carried out with antisera against the 19 reference strains of serogroup Sejroe, revealing a close relationship with serovar guaricura. Afterwards the MAT was done with a panel of 18 monoclonal antibodies representative for serovars of serogroup Sejroe. The histogram closely resembled that of serovar guaricura. So Cross Agglutination Absorption Test (CAAT) was carried out with the buffalo isolate and serovar guaricura, supporting the relationship between the buffalo isolate and serovar guaricura. Em Abril de 1998 foram colhidas amostras de urina de búfalas fêmeas adultas em uma Fazenda localizada em Registro, Vale do Ribeira, São Paulo, Brasil. Estas amostras foram obtidas após a injeção de furosemida (0,8 mg/kg, iv), transportadas para o Laboratório em meio de EMJH modificado e semeadas pela técnica das diluições seriadas em meios de Fletcher ou EMJH modificado com 0,2% de agar, ambos acrescidos de 5-fluorouracil 100 mg/mL. Também foi efetuada a inoculação, em hamsters (M.auratus), 0,5 mL da amostra, via intraperitonial. Todos os cultivos de urina apresentaram contaminação e foram descartados. Os hamsters não apresentaram sinais de doença e foram sacrificados no 21º dia pós-inoculação; nesta ocasião foram efetuados cultivos do tecido renal destes animais, dos quais foi isolada uma estirpe de leptospira (M04-98). A identificação deste isolado foi iniciada com um painel de 36 antisoros contra amostras patogênicas e o mesmo foi identificado como pertencente ao sorogrupo Sejroe. Subseqüentemente com painel de anticorpos monoclonais e teste de absorção cruzada de aglutininas a identidade do isolado foi confirmada como L. santarosai, sorogrupo Sejroe, sorovar guaricura. Este foi o primeiro isolamento de leptospira de búfalos efetuado no Brasil

Isolation of Leptospira santarosai, serovar guaricura from buffaloes (Bubalus bubalis) in Vale do Ribeira, São Paulo, Brazil