1. Balka G, Hornyak A, Balint A, Kiss I, Kecskemeti S, Bakonyi T, Rusvai M (2008) Genetic diversity of porcine reproductive and respiratory syndrome virus strains circulating in Hungarian swine herds. Vet Microbiol 127:128–135
2. Batista L, Pijoan C, Lwamba H, Johnson CR, Murtaugh MP (2004) Genetic diversity and possible avenues of dissemination of porcine reproductive and respiratory syndrome virus in two geographic regions of Mexico. J Swine Health Prod 12:170–175
3. Carman S, Sanford SE, Dea S (1995) Assessment of seropositivity to porcine reproductive and respiratory syndrome (PRRS) virus in swine herds in Ontario—1978 to 1982. Can Vet J 36:776–777
4. Doan DN, Dokland T (2003) Structure of the nucleocapsid protein of porcine reproductive and respiratory syndrome virus. Structure 11:1445–1451
5. Drew TW (1996) Studies on the genome and proteins of porcine reproductive and respiratory syndrome virus. PhD Thesis, The Open University, London