Objective: To prepare Vero cell-adapted influenza H5N1 virus strain by Genetic Reassortment and produce influenza H5N1 vaccine using Vero cell as a substrate.
Methods: Embryonated specific pathogen-free (SPF) hen's eggs and Vero cells were co-infected with Vero cell-adapted influenza virus A/Yunnan/1/2005 Va(H3N2) and A/Anhui/1/2005 (H5N1) via reverse genetics. The reassortant was screened with goat antibody against strain A/Yunnan/1/2005 Va(H3N2) and identified for subtype by hemagglutination-inhibition (HI) assays and gene analysis of HA and NA.
Results: A Vero cell-adapted influenza H5N1 virus strain was obtained, and there was no significant difference in serum antibody titers of monovalent inactivated vaccine reassorted before and after (F = 0.857, P > 0.05).
Conclusion: The Vero cell-adapted influenza virus of epidemic strain may be reassortment between Vero cell-adapted and epidemic strains.