PORCINE REPRODUCTIVE RESPIRATORY SYNDROME (PRRS) IN JAPAN - A FIELD FORCE SURVEY IN 45 FARMS

摘要

Porcine Reproductive Respiratory Syndrome (PRRS) infection is a common disease and resulting in a big economical burden for the swine industry. Pigs infected with PRRS lose resistance to other porcine diseases and get infected quite easily with otherpathogenic agents, e.g. Actinobacillus pleuropneumoniae (App). In 1993, when a method to measure PRRS antibody titre became available, it was realised that PRRS infection had occurred in the Kanto and Shikoku region already during earlier years. However,due to Aujeszky's disease (AD) also causing respiratory disease and abortion, PRRS was not widely recognised before 1993. Since then, PRRS infection has been observed throughout Japan. The results of Japanese national investigation conducted 1994 showed the prevalence of PRRS to be up to 70%.