The epidemic trend and demographic characteristics of respiratory viruses in the first year. (A) Monthly activity patterns of viruses. (B) The proportions of different viruses in the first year. (C) The proportions of different sexes among positive children. (D) The proportions of different viruses among positive children. (E, F) The proportions of different categories and ages of positive children. Flu A, influenza A; Flu B, influenza B; PIV I, parainfluenza virus I; PIV II, parainfluenza virus II; PIV III, parainfluenza virus III; ADV, adenovirus; RSV, respiratory syncytial virus; D, day; M, month; Y, year.