3Pensaert M B, Debouck P.A. new coronavirus-like particleassociated with diarrhea in swine [J]. Arch Virol, 1978, 58 (3):243-247.
4Timoney J. F,Gillespie J. H,Scott F.W,et a1.1988. Mierobiology and Infectious diseases of Dom -estic AnimalaComstock Publishing Associates,Ithaca pp897-898.
5Takahashi K, Okada K, Ohshima K.1983.An Outbreak of Swine Diarrhea of a New-type Asso- eiated with Coronavirus-tike Particles in Japan. Vet Sei, 45:829-832.