The trivalent influenza vaccine contains all of the following strains except:
Correct Answer: H2N 1
Description: Ans: C. H2N 1Each seasonal influenza vaccine contains antigens representing three (trivalent vaccine) or four (quadrivalent vaccine) influenza virus strains: one influenza type A subtype H1 N1 virus strain, one influenza type A subtype H3N2 virus strain, and either one or two influenza type B virus strains.
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