A rapid decrease in viral gastroenteritis during winter 2019-20 and a return of norovirus and rotavirus activity during winter 2020-21 were observed while multiple nonpharmaceutical interventions for coronavirus disease were in effect in Hong Kong. The initial collateral benefit of coronavirus disease countermeasures that reduced the viral gastroenteritis burden is not sustainable.
Keywords: COVID-19; coronavirus disease; norovirus; respiratory infections; rotavirus; seasonality; severe acute respiratory syndrome coronavirus 2; viral gastroenteritis; viruses; zoonoses.