7K.Jung,J.Kim,Y.Ha,et al.The effects of transplacental porcine circovirus type 2 infection on porcine epidemic diarrhea virus-induced enteritis in preweaning piglets[J].Pigs and poultry,2007,issue 2,51-53.
8M.Pensaert,Zhou Yaling,J.Ederveen,et.al.Archives of Virology[M].New York,1988,102 (1-2):63-71.