A serological survey for leptospirosis was performed in farms that had cows with reproductive problems, in the region of Londrina, Paraná State, Brazil. Twenty-two serotype of L. interrogans were investigated, using rapid microscopic agglutination test in 1253 serum samples. One-hundred-sixty-six serum samples (13.25%) from 10 farms (71.43%) presented antibodies agaisnt L. interrogans. Antibodies against two or more L. interrogans serotypes were found in 56 animals. Antibodies against the serotype icterohaemorrhagiae were found in 48 (28.91%) animals, whereas antibodies against pomona were found in 35 (21.08%), bataviae in 28 (16.87%), autumnalis in 24 (14.46%) , canicola in 19 (11.44%), hardjo in 18 (10.84%), bratislava in 17 (10.24%), butembo in 13 (7.83%), pyrogenes in 12 (7.22%), hebdomadis in 11 (6.63%) and wolffi in 10 (6.02%).
bovine; Leptospira interrogans; serological survey
