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[Leptospirosis outbreak in calves from Corrientes Province, Argentina].

Leptospirosis is an infectious disease resulting in significant economic losses in livestock production. This disease causes abortion, embryo death, death of calves within the first few days of life and mastitis. We report a leptospirosis outbreak in calf growing and fattening. Histopathological and hemoparasite studies, immunofluorescence, and bacterial cultures were performed. A strain of Leptospira interrogans serovar Pomona was isolated from samples collected from dead calves.