8Mortensen S, Stryhn H, Sogaard R, et al. Christensen J, Willeberg P: Risk factors for infection of sow herds with porcine reproductive and respiratory syndrome (PRRS) virus. Preventive Veterinary Medicine, 2002, 53 : 83 - 101.
9Meng XJ. Heterogeneity of porcine reproductive and respiratory syndrome virus: implications for current vaccine efficacy and future vaccine development. Veterinary Microbiology, 2000, 74: 309- 329.
10Magar R, Larochelle R, Nelson EA, et al. Differential reactivity of a monoclonal antibody directed to the membrane protein of porcine reproductive and respiratory syndrome virus. Canadian Journal of Veterinary Research, 1997, 61 : 69 - 71.
