variables associated with infections of cattle by brucella abortus., leptospira spp. and neospora spp. in amazon region in brazil.the frequency of neospora spp., leptospira spp. and brucella abortus infections in adult cattle was determined in herds of the state of pará, brazil, which is an important region for cattle production located in the amazon region. a total of 3466 adult female cattle from 176 herds were tested, leading to a frequency of seropositive animals of 14.7%, 3.7% and 65.5% and a herd positivity of 87.4%, 41.3% and 98.8% for infections caused by neospora spp., b. abortus and leptospira spp., respectively. ...201526302373
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