The Yucaipa Strain of PMV-2 virus, which is the standard strain of the virus, and other three isolated strains in China we re propagated in the allantoic cavity of SPF chicken eggs, and purified by disco ntinuous sucrose density gradient centrifugation.

• 将禽副粘病毒 2型的标准毒株Yucaipa病毒和国内分离株F4、F6和F8株分别接种SPF鸡胚 ,收获鸡胚尿囊液 ; 经差速离心和蔗糖密度梯度离心后 ,分别制备电镜样品和免疫电镜样品 ;