1Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2Department of Pathobiology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran;
3Graduated from Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran
4Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
To investigate the seroprevalence of leptospiral infection in sheep in Ahvaz, southwestern Iran, blood samples were taken from 181 female sheep. Sera were stored at -20°C until use. They were initially screened at serum dilution of 1:100 against six live antigens of Leptospira interrogans serovars pomona, canicola, hardjo, ballum, icterohaemorrhagiae, grippotyphosa using the microscopic agglutination test (MAT). The samples were considered positive if ≥ 50% of agglutination of leptospire in a dilution test serum of ≥ l:100 were observed. Sera with positive results were titrated against reacting antigens in serial two-fold dilutions from l:100 to 1:1600. Antibodies against one or more serovars were detected in 27 (14.9%) sera at dilution ≥1:100. Antibodies against more than one serovar were found in 5 (18.5%) positive sera. Among the positive sera, antibodies were most frequent to serovar pomona (43.8%) followed by canicola (21.9%), icterohaemorrhagiae (12.5%), grippotyphosa (9.4%), ballum and hardjo (each of them 6.3%). The results of this survey indicate that leptospiral infection is common in sheep in Ahvaz and that various serovars concur in the etiology.