ABSTRACT
In 2001, 698 urine samples were randomly collected from cattle at a slaughterhouse in the State of Paraná, Brazil. Direct examination using dark field microscopy was carried out immediately after collection. Five putative positive samples were cultured in modified EMJH medium, yielding two positive cultures (LO-14 and LO-10). Typing with monoclonal antibodies revealed that the two isolates were similar to Canicola (LO-14) and Copenhageni (LO-10). Microscopic agglutination test results show that Hardjo is the most common serovar in cattle in Brazil. Rats and dogs are the common maintenance hosts of serovars Copenhageni and Canicola. The excretion of highly pathogenic serovars such as Copenhageni and Canicola by cattle can represent an increasing risk for severe leptospirosis is large populations, mainly living in rural areas.
No ano de 2001, 698 amostras de urina foram colhidas aleatoriamente, durante o abate em um frigorífico do Estado do Paraná, Brasil. O exame direto em microscópio de campo escuro foi realizado imediatamente após a colheita. As cinco amostras de urina positivas neste exame foram semeadas em meio EMJH modificado, sendo possível o crescimento de leptospiras em duas (LO-14 e LO-10). As estirpes isoladas foram tipificadas, por painel de anticorpos monoclonais, como mais similares ao perfil das amostras de referência dos sorovares Canicola (LO-14) e Copenhageni (LO-10). No Brasil, inquéritos sorológicos utilizando a prova de soroaglutinação microscópica mostram o predomínio de reações para o sorovar Hardjo em bovinos. Roedores e cães são os reservatórios mais comuns dos sorovares Copenhageni e Canicola, respectivamente. A eliminação dos sorovares Canicola e Copenhageni pela espécie bovina pode resultar em um aumento na ocorrência de casos graves de leptospirose humana, principalmente na população rural.
Subject(s)
Animals , Cattle , Antibodies, Monoclonal , Leptospira interrogans serovar canicola/growth & development , Leptospira interrogans serovar canicola/isolation & purification , Leptospirosis/diagnosis , Veterinary Medicine , Agglutination Tests , Methods , Sampling Studies , Methods , UrineABSTRACT
Leptospira interrogans serovar canicola strain moulton was grown to a high cell density in a protein-free medium. When hemin was added to this medium, hemolysin was produced. Hemolysin was not detected when other porphyrins or cytochrome C were substituted for hemin in the medium.