The sera of 195 hunter-killed feral pigs (Sus scrofa), collected in New South Wales (Australia) from April to November 1995, were screened against a reference panel of 14 Leptospira interrogans serovars using a microscopic agglutination test (MAT). The panel represented those serovars previously isolated from wild and domestic mammals in mainland Australia. Anti-leptospiral agglutinins were detected in 20% of the sera tested and included nine L. interrogans serovars. The majority of serological reactors (63%) were to L. interrogans serovar pomona. Sera from 26% of immunoreactors cross reacted with antigens from one or more serovars. No differences were noted in the prevalence of L. interrogans antibodies between the sexes, or between pigs from areas of low and high rainfall. The implications of leptospirosis in feral pigs on the transmission of leptospires to wildlife, livestock, and humans are discussed.
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