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Influenza A virus A/California/7/2009 X-181 (H1N1) hemagglutinin antigen (formaldehyde inactivated) is an influenza antigen used in seasonal influenza vaccines.
Influenza A virus A/California/7/2009 X-181 (H1N1) hemagglutinin antigen (formaldehyde inactivated) is an influenza antigen used in seasonal influenza vaccines.
