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Antibody titers by hemagglutination inhibition (HAI) and neuraminidase inhibition (NAI) against vaccine antigens in 2016–2017 (A) and 2017–2018 (B). The A/Hong Kong/4801/2014 (A/Hong Kong) strain was included in both the 2016–2017 and 2017–2018 influenza vaccines; the A/Singapore/INFIMH-16–0019/2016 strain was subsequently selected as the H3N2 strain included in the 2018–2019 vaccine. Error bars represent 95% confidence intervals.
