PREVALENCE OF ANTIBODIES TO DIFFERENT LEPTOSPIRA-INTERROGANS SEROVARSIN PIGS ON LARGE FARMS

A seroepidemiological survey was carried out in the province of Badajo z (south-western Spain) in order to determine the presence and spread of Leptospira interrogans. The 521 sera tested were drawn from breedin g sows on 28 large farms (15 with fewer than 60 and 13 with over 60 br eeders). Immunological testing was performed using the Martin-Pettit m icro-agglutination technique. Pigs with titres equal to or greater tha n 1:100 were considered positive. Haemolysed and/or contaminated test sera were reprocessed following filter-paper treatment. A total of 10. 56% of pigs tested proved positive, 39.28% of farms being affected. Th e australis (0.38%), hebdomadis (0.19%) and ictero-haemorrhagiae (0.19 %).