FIGURE 1.

Carbon dioxide sampling locations within the hospital and the patient route in case of confirmed severe acute respiratory syndrome coronavirus 2 infection. ^aCT: computed tomography. Patient C1‐5: the confirmed COVID‐19 Patient 1–5. COVID‐19: coronavirus disease 2019. ^bGray dotted line: COVID‐19 patient route before treatment. Red dotted line: COVID‐19 patient route after becoming a suspected COVID‐19 patient. ^cIn February 2020, five COVID‐19 patients went to Changgung Hospital and were numbered as C1‐C5 according to the order of their registration time. According to medical records, the diagnosis process for confirmed patients is outpatient clinic, CT room, and isolation ward. Patient C1 went to the pediatrics department, emergency hall, CT room, and isolation ward. Patient C2‐C4 went to the fever clinic, emergency hall, CT room, and isolation ward. Patient C5 went to the emergency hall, emergency internal medicine, CT room, and isolation ward. ^dThe sensors were placed approximately 0.8–1.2 m above ground and far from CO₂ emission sources. The measurement range of the sensor is calibrated between 400 and 1000 ppm, its accuracy is ±50 ppm and its measurement interval is 5 min