Study Population
A total of 248 cases were diagnosed with SMPP, of which 213 cases met the enrollment criteria. The average time period that elapsed from disease onset to first bronchoscopy was 8.9 ± 2.4 days, with the average number of prior bronchoscopies found to be 2.2 ± 1.8. Of the enrolled cases, 142 cases (142/213, 66.7%) had their first bronchoscopy within 10 days post-disease onset, while 71 cases (71/213, 33.3%) had their first bronchoscopy 10 days post-onset of disease. 183 cases (183/213, 85.9%) underwent bronchoscopy no more than twice, while 30 cases (30/213, 14.0%) underwent bronchoscopy at least three times (Table 1).