3Hansen W R, Brown S E, Nashold S E, et al. Identification of duck plague virusby polymerase chain reaction [ J ]. AvianDisease, 1999,43 (1) :106 -115.
4Pritchard L, Morrissy C, van Phuck, et al. Development of a polymerase chain reaction to detect vietnamese isolates of duck virus enteritis [ J ]. Veterinary Microbiology, 1999,68 ( 1/2 ) : 149 - 156.
