Viral plaques were formed after virus supernatants attachment to three cell lines FHM,TSB,and GCO,and the plaques of 1 to 4 mm in diameter is probably dependent on host cell lines and viral diluents.

• 在FHM,TSB和GCO等细胞中可产生直径1~4 mm的圆形空斑,空斑的大小与宿主细胞的种类和接种的病毒浓度有关。