Pesquisa de anticorpos para sorovares de Leptospira interrogans patogênicas em equídeos criados na ilha de Algodoal, Estado do Pará A study of anti-Leptospira interrogans antibodies in horses bred on Algodoal island, in the Brazilian State of Pará

This study evaluated the occurrence of antibodies against Leptospira interrogans in horses on Algodoal island/in the Brazilian State of Para, establishing the distribution of serovars with respect to the sex and age of animals. The study used 37 serum samples from adult animals that were subjected to the microscopical seroagglutination test, in which 100% (37/37) were reagents in the titration 1:100 to one or more serovars of Leptospira interrogans. The highest percentage of reagents was observed for the Australis serovar with 54.05% (20/37). Males showed a higher frequency of reaction to the Australis serovar, while females reacted more to Sentot. With regard to age, in group 1 (2 to 7 years) most samples reacted to the Cynopteri serovar (36.36% (8/22)); in group 2 (> 7 to 13 years) both Butembo and Sentot serovars responded equally (60.0% (6/10)), and in group 3 (> 13 years) 100% (5/5) samples reacted to the Pyrogenes serovar. This study therefore leads to the conclusion that a variety of Leptospira interrogans can occur in the horses of the island of Algodoal (PA), since 37 of the horses tested positive to the microscopical seroagglutination test.