| seroprevalence to leptospira interrogans serovar hardjo in merino stud rams in south australia. | a serological survey of 2160 merino stud rams on 36 farms detected positive reactions greater than or equal to 1/100 in 42% of animals using the microscopic agglutination test (mat) to leptospira interrogans serovar hardjo. twenty flocks had seroprevalence values greater than 30% with 15 flocks having values > or = 60%. the enzyme-linked immunosorbent assays showed that 47% and 3% of rams on the 36 farms were positive for igg and igm antibodies, respectively. forty-five percent of hardjo reactio ... | 1994 | 7945098 |