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The HI and NI antibody titers to A/California/07/2009(H1N1)pdm09 after vaccination with LAIV or natural infection in persons with ≥fourfold HI antibody conversions. Antibody titers in LAIV recipients before vaccination and on day 21 after vaccination (n = 6). Antibody titers in the paired sera collected from convalescents with laboratory confirmed influenza A (n = 8).
