4Pensaert M B, De Bouck P. A new coronavirus-like particle associated with diarrhea in swine[J]. Arch Virol, 1978,58(3) = 243-247.
5Fields B N,Knipe D M, HoMey P M,et al. Fields virolo- gy[M]. 4th ed. Philadelphia= Lippincott Williams &- Wilkins,2001.
6Park S J, Song D S, Ha G W, et al. Cloning and fur- ther sequence analysis of the spike gene o{ attenuated porcine epidemic diarrhea virus DRla[J]. Virus Genes ,2007,35(1) :55-64.
8Timoney J F,Gillespie J H, Scott F W, et al. Microbi- ology and infectious disease of domestic animals[J]. Comstock Publishing Associates Ithaca, 1988, 8: 897-898.
9Shibata I,Tsuda T,Mori M,et al. Isolation of porcine epidemic diarrhea virus in porcine cell cultures and experimental infection of pigs of different ages [J]. Vet Microbio1,2000,72(3-4) :173 182.
10Shibahara T, Sato K, Ishikawa Y, et al. Porcine circo- virus induces B lymphocyte depletion in pigs with wasting disease syndrome[J]. J Vet Med Sci, 2000, 62(11) :1125-1131.
