CBLIF and coinfection: Severe-ApCAP group = 97/215 (45.12%), MP = 84/97 (86.60%), CP = 6/97 (6.19%), LP = 7/97 (7.22%); Co-infection with bacteria = 27.83% (27/97): SP = 14/27, HI = 8/27, co-infection with respiratory viruses = 13.4% (13/97): RSV = 2/13, INF = A/B virus = 3/13, AdV = 4/13, RV = 4/13.