SEROLOGICAL INVESTIGATIONS TO DEMONSTRATE THE PRESENCE OF ANTIBODIES TO THE VIRUSES CAUSING PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME, AUJESZKYS-DISEASE, HOG-CHOLERA, AND PORCINE PARVOVIRUS AMONG WILD BOAR(SUS-SCROFA, L, 1758) IN NORTHRHINE-WESTFALIA

From 1992/93 to 1995/96 in Northrhine-Westfalia and in two counties in the neighbouring state of Rhineland-Palatinate 768 blood serum sample s were collected from wild boar and examined for the presence of antib odies to the following viral illnesses: PRRS (Porcine Reproductive and Respiratory Syndrome), PPV (Porcine Parvoviruses), ESP (Hog cholera), and AK (Aujeszky's Disease) (Tab. 1). In no case was there evidence f or the presence of antibodies against PRRS and ESP. Antibodies against AK were found in 7% of the serum samples and against PPV in 77% (Tab. 7). The samples stratified according to age groups, young pigs to 15 months, juvenile boar to 2 years and those over two years correspond t o the average age groups in the hunting records (Tab. 3, 4). The posit ive findings for the AK virus were spatially concentrated at the perim eter of the wild boar distribution around the Kolner Bucht and were ad jacent to two outbreaks of the AK virus among domestic pigs. The avera ge positive reactions among the age groups were as follows: 3% young p igs, 9% juveniles, 18% older wild boar (Tab. 6). Of 121 samples analyz ed for PPV 61% of the young boar, 69% of the juveniles, and 98% of the older boar reacted positively (Tab. 5). The high percentage of positi ve reactions to the long-lived antibodies against PPV shows that this the wild boar populations.