4Ben S A N, Chupin S A, Bjadovskaya O P, et al. Multiplex nes- ted RT-PCR for the detection of porcine enteric viruses[J]. J Virol Methods, 2010, 165(2): 283-293.
5Cavanagh D. Nidovirales: A new order comprising coronaviridae and arteriviridae[J]. Arch Virol, 1997, 142: 629-633.
6Debouck P, Pensaert M. Experimental infection of pigs with a new porcine enteric coronavirus CV777[J]. Am J Vet Res, 1980, 41: 219-223.
7Jung K, Kang B K, Lee C S, et al. Impact of porcine group A rotavirus co-infection on porcine epidemic diarrhea virus pathoge- nicity in piglets[J]. Res Vet Sci, 2008, 84(3): 502-506.
8Kim S Y, Song D S, Park B K. Differential detection of trans- missible gastroenteritis virus and porcine epidemic diarrhea virus by duplex RT-PCR[J]. J Vet Diagn Invest, 2001, 13: 516-520.
9Pritchard G C, Panton D J, Wibberley G, et al. Transmissible gastroenteritis and porcine epidemic diarrhea in Britain[J]. Vet Rec, 1999, 144: 616-618.
10Sun R Q, Cai R J, Chen Y Q, et al. Outbreak of porcine epi- demic diarrhea in suckling piglets, China[J]. Emerging Infec- tious Diseases,2012, 18(1) : 161-162.