Gouma S, Weirick M, Hensley SE. Potential antigenic mismatch of the H3N2 component of the 2019 Southern Hemisphere influenza vaccine. Clin Infect Dis. 2019 Aug 11.
Here, we find that the egg-adapted H3N2 component of the 2019 Southern Hemisphere influenza vaccine elicits an antibody response in ferrets that is highly focused on antigenic site A of hemagglutinin. This is potentially problematic since most H3N2 viruses currently circulating in the Southern Hemisphere possess antigenic site A substitutions.
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