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Number of respiratory viruses that were a single or co-infection
aCo-infection was counted as a separate case.
IFA, influenza A virus; IFB, influenza B virus; RSV, respiratory syncytial virus; PIV, parainfluenza virus; AdV, adenovirus; hRV, human rhinovirus; hMPV, human metapneumovirus; hCoV, human coronavirus.
