1. Lunney JK, Benfield DA, Rowland RR. Porcine reproductive and respiratory syndrome virus: an update on an emerging and re-emerging viral disease of swine. Virus Res. 2010;154:1–6.
2. Holtkamp DJ, Kliebenstein JB, Neumann EJ, et al. Assessment of the economic impact of porcine reproductive and respiratory syndrome virus on United States pork producers. J Swine Health Prod. 2013;21:72–84.
3. Wensvoort G, Terpstra C, Pol JM, ter Laak EA, Bloemraad M, de Kluyver EP, et al. Mystery swine disease in The Netherlands: the isolation of Lelystad virus. Vet Quart. 1991;13:121–8.
4. Keffaber KK. Reproductive failure of unknown etiology. Am Association Swine Pract Newsl. 1989;1:1–9.
5. Faaberg KS, Balasuriya UB, Brinton MA, Gorbalenya AE, Leung FC-C, et al. Arteriviridae. In: Virus taxonomy, 9th report of the International Committee on taxonomy of viruses. London: Elsevier/Academic Press; 2012.