Epidemiology of porcine reproductive and respiratory syndrome (PRRS): an overview.
- E Albina
- Veterinary microbiology
Materials and methods: Pigs 3, 9, 16, and 24 weeks of age from 41 sow sources representing one-, two-, and three-site production systems were necropsied on the basis of acute, subacute, and chronic disease stages (n = 5 animals per age group per farm). Logistic regression models were used to assess co-infection with other pathogens, serological profiles, and histopathological lesions in pigs PRRSV-positive by polymerase chain reaction and with lung lesions consistent with PRRSV infection, and in PRRSV-negative pigs. Additional models were stratified by age and type of production system.