Results
Despite reduced respiratory virus circulation, HRV type A and C
infections persisted in children, with sporadic detection of HRV B and
other respiratory viruses. A resurgence of HRV A cases in November 2020,
dominated by genotypes A47 and A101, was observed during the relaxation
of PHSMs between the third and fourth waves of COVID-19. Strict PHSMs
implemented during the fourth wave, including school closures,
substantially reduced respiratory virus circulation, though overall
diversity increased due to heightened vigilance. HRV genotype A49 became
predominant in May 2021 upon relaxation of control measures, with
phylogenetic analysis suggesting persistence of multiple transmission
lineages despite strict PHSMs. Genotypes A49 and A47 were frequently
associated with upper respiratory tract infections, highlighting their
epidemic potential.