Abstract
The prevalence of antibody to six serovars of Leptospira interrogans in cattle in Asturias
(Northern Spain) was determined by the microscopic agglutination test (MAT). Using 50%
agglutination or lysis at a dilution of 1[ratio ]10 or more as the criteria for seropositivity, 371 of
3578 (10·36%) animals were found to react with one serovar. The most commonly detected
serovars were pomona (5·59%) and grippotyphosa (2·37%),
whilst serovar hardjo (0·75%), icterohaemorrhagiae (0·64%), poi
(0·64%) and autumnalis (0·36%) were found at lower frequencies.