All the isolated viruses grew very well in MDCK cells, but there were only 6 strains (2.1%) in embryonated chick eggs. 21 Avian influenza surveillance specimens were all negative in H5 subtype by.

• 285株流感病毒都能适应MDCK细胞，但阳性标本液直接接种鸡胚阳性率极低，仅为2.；1%25(6/285)。