Article
[Genetic mutations of heamagglutinin genes of H9N2 subtype influenza A viruses in the field in a five-year period].
Wei sheng wu xue bao = Acta microbiologica Sinica - 1 Dec 2003
Liu Hongqi, Zhang Pinghu, Liu Xiufan, Liu Wenbo, Jia Lijun
Abstract excerpt
Infection in chicken flocks on a farm, where AI outbreak took place in 1998, was monitored in a four-year consecutive period and 22 H9N2 subtype viruses were isolated. The HA gene and antigenicity of 9 strains among isolates were compared with that of isolate of 1998. The results indicated that mutations of HA genes of H9 subtype influenza A viruses were observed during five years. However these mutations of HA...
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