Field evaluation of a new MLV PRRS virus vaccine Applications for PRRS prevention

摘要

"A 500 sow midwestern swine farm with a history of serious problems with Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) and Streptococcus suis in post-weaning pigs was selected for evaluation of a new Modified Live. PRRS Vaccine (IngelvacPRRS MLV) in pigs under field conditions. PRRS was first clinically diagnosed in the herd in late 1991 (November), prior to the time when reliable serologic tests and virus isolation procedures were available. Since confirmatory tests have become available, PRRSV has been isolated from nursery pigs (December 1992) and antibody testing (IFA) of pigs have demonstrated seroconversion to PRRSV (October 1992), as detected by the immunof-luorescent antibody (IFA) test. The farm has had a history of excessive nursery mortality and high veterinary/health product costs since PRRS was first clinically diagnosed (Figures la and 1b).