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. 2026 Apr 16;16:1796357. doi: 10.3389/fcimb.2026.1796357

Figure 1.

Flowchart shows selection of patients hospitalized with suspected acute respiratory infections from March 2024 to August 2025, indicating 2,299 enrolled; 454 had bronchitis/tracheitis, 1,845 had pneumonia with further subdivisions, and exclusions listed.

Participant recruitment for the study.