Antibodies in dogs against Leptospira interrogans serovars copenhageni, ballum and canicola

In a nationwide survey carried out during 1990-91 of more than 5800 dogs to detect antibodies against Leptospira interrogans serovars copenhageni, ballum and canicola, only one weak reactor against serovar canicola was found. Reactors of varying titre were found against serovar ballum in 0.7% of dogs tested, indicating sporadic infection with this serovar. Reactors (0.9%) to serovar copenhageni came mainly from the Waikato, Northland and the Auckland region. This was in agreement with the reported occurrence of the clinical syndrome and with the results of a smaller survey in urban Auckland, in which more than 5% of dogs tested were seropositive to serovar copenhageni.