A study was conducted to determine how important rats and dogs are in the dissemination of leptospirosis in farms and stales located in Ciudad Guzmán, Jalisco. Thirteen of Leptospira interrograns serovarieties were used in microagglutination test of serogroups (MAT). Three hundred and fifty four rats (Rattus rattus and Rattus norvergicus) trapped in agricultural areas of the place were studied; 22 were positive (6,2%) and 34 suspected of leptospirosis (9,6%). Also four hundred and nineteen dogs from the region were tested; 22,6 % (95 dogs) were positive and 5,7%(24) suspected of L. Interrogans. These results showed that both species are important in the dissemination of the disease.
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