Objective To observe the plaque forming characteristics of different H5N1 avian influenza virus strains.And contrast the differences of pathogenicity and replication of various virus strains with different plaque forming characteristics.Methods Different H5N1 avian influenza virus strains in serial dilutions were inoculated to MDCK cells.Then the cells were covered with nutritious agar,and dyed some day after being infected with viruses.The plaques of different H5N1 virus strains were observed and titrated ...

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