Leptospirose em bovinos abatidos em matadouros no Estado do Pará.

Abstract

This research was aimed to verify the seroprevalence of leptospirosis as well as to show the presence of leptospira in the slaughterhouse samples picked out at random from some counties of Pará State, Brazil. The serological research was carried out through microscopic agglutination test, using 27 strains of live antigens. The direct demonstration of leptospires through the silver impregnation method on kidney samples and through the Vágó method on urine and kidney samples was also performed. Out of the 131 samples studied from seven herds 102 (77,8%) showed positive to at least one serovar. The percentage of positivity in herds was 45 t9 90%. The serovar that showed the highest prevalence was the hebdomadis which reacted in 41,2%, followed by the hardjo in 33,6%, the andamana and bratislava in 12,9%, the patoc in 7,6%, the pomona and sejroe in 6,8%. The other serovars reacted in less than 4%. The maximum títle studied was of 800, found in the serovars hardjo, hebdomadis, andamana, pomona and the javanica. The 400 title was found in the serovars djasiman, patoc and sejroe while the 200 title was found in the bratislava, castelonis, shermani, saxcoebing, pyrogenes, tarassovi and the australis. The 100 title was found in the serovars canicola, cynopteri, wolffi, ballum, icterohaemorrhagiae e celledoni. Other serovars not reacted. at a maximum title of 100. The Vágó coloring method on urine samples for direct exposure of leptospires presented a 29,9% (32/107) positívity rate, whereas in kidney samples this rate was 24,4% (32/131). By means of the silver impregnation method on kidney samples, it was possible to detect leptospires in 34,7% (42/121) of studied samples.