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Kinetics of antibody response to H1N1pdm09 infection among PCR‐confirmed index cases. The Microneutralization (MN) and hemagglutination inhibition (HI) titers of 30 serum samples from 16 PCR‐confirmed index cases and three PCR‐confirmed close contacts are grouped by number of days after symptom onset in 7‐day intervals. Random staggering of paired data points (MN and HI titers) was used to optimize data presentation.
