Blood samples from 39,012 bovines were tested for microscopic agglutination through Leptospira interrogans. An overall of 398 (47%) of Minas Gerais State's municipalities from 1980 to 2002 composed the sample. The most frequent serovars were hardjo (Norma sample), 23.7%, followed by hardjo (OMS sample), 19.7%, hardjo (hardjobovis sample), 13.8%, and wolffi, 13.2% of positivity. The results showed the importante of hardjo serovars as a major cattle health problem in Minas Gerais. The low rates of the seropositivity for Pomona, 2.8%, and mini (Neguita sample), 3.0%, are an indicative which these serovars should be considered as an explanation of clinical cases in cattle when the absence of reaction for hardjo (Norma sample), hardjo (OMS sample) and hardjo (hardjobovis sample). The reaction rates for canicola and icterohaemorrhagiae serovars were below 1.0%. The bovine infection for Leptospira interrogans is endemic in the State of Minas Gerais.
cattle; agglutinin; Leptospira interrogans; Minas Gerais
