Seasonality and clinical impact of human parainfluenza viruses.
Philip MaykowskiMarie SmithgallPhilip ZachariahMatthew OberhardtCelibell VargasCarrie ReedRyan T DemmerMelissa S StockwellLisa SaimanPublished in: Influenza and other respiratory viruses (2018)
HPIV-4 presented late summer and early fall annually and was associated with increased severity of illness in hospitalized children.