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Underlying upper respiratory tract infections do not alter vaccine immunogenicity. An additional nasal swab was collected from a subset of children (n = 83) to detect pre‐existing infections prior to live attenuated influenza vaccine (LAIV). Proportion of RNA‐positive swabs and virus type detected (a). Fold change in immunoglobulin (Ig)G specific for H1 (b) and H3 (c) were compared in children with and without co‐infection.
