Fig. 2

Distribution characteristics in different ages. (A) The bar chart described the age distribution of RIs: * represents P < 0.05, *** represents P < 0.001. (B) The column diagram described the age distribution of CMV, SP, and RSV. (C) The column diagram described the age distribution of IAV, IBV, ADV, and MP. (D) The linear chart depicted the distribution of MP and RSV at different ages. (E) The error bar chart of single and mixed infections. (F) The distribution of single and mixed infection rates.