Endemic Variation of H9N2 Avian Influenza Virus in China.

Forty-two H9N2 subtype AIV strains were isolated from vaccinated commercial chickens in China from 2012 to 2015. Their HA genes had nucleotide sequence homology from 86.7% to 99.

[The effect of newcastle disease virus on the biological behavior of tumor cells].

Aim: To investigate the anti-tumor effect of newcastle disease virus (NDV).

Methods: Plaque formation test was used to investigate the effect of NDV on chicken embryofibroblasts(CEF). Cell suppression test, agarose gel electrophoresis, cytoskeleton staining, fluorescence staining, TUNEL staining, and sialic acid content determination were used to observe the influence of NDV on several human tumor cells.