Fig. 1

Flow chart of the study. *For 2742 cases presenting with pulmonary infections in the retrospective cohort, 2144 patients did not meet the selection criteria. Among them, 488 patients were excluded as they were younger than 18 years or older than 65 years of age. The remaining 1656 patients were excluded as requisite data were missing, among which were 98 for CT, 620 for ESR, 593 for PCT, 68 for CD4 + T-cell count, 193 for HIV RNA, 169 for ALB, and 138 for microorganism evidence. #For 755 cases in the prospective cohort, 419 patients were excluded as requisite data were missing, among which were 13 for CT, 145 for ESR, 143 for PCT, 18 for CD4 + T-cell count, 43 or HIV RNA, 44 for ALB, and 32 for microorganism evidence