Prevalence of leptospirosis in dairy cattle from small rural production units in Toluca Valley, State of Mexico.

In order to know the seroprevalence of Leptospira spp. in stabled dairy cattle, a study was conducted from 2004 to 2006 in which 416 sera were tested using a microscopic agglutination test conducted on microplates. A collection of culture reference antigens, each representing a serogroup, was used for these tests. Results showed that 10.33% (43) of the animals had antibody titers ranging from 1:100 to 1:1600. The main serovars detected in these tests were L. interrogans serovar hardjo and L. interrogans serovar canicola. It is important to note that these serovars represent a high risk for transmission to other susceptible animal species, between individuals, and to human health. This serological survey provides useful information establishing the presence or absence of these serovars in this type of herd. The range of antigens used in this study included serovars representative of all common serogroups.