17 April 2021 : Clinical Research
Epidemiology of 631 Cases of COVID-19 Identified in Jiangsu Province Between January 1st and March 20th 2020: Factors Associated with Disease Severity and Analysis of Zero Mortality
Hong Ji1AE, Qigang Dai1AC, Hui Jin2C, Ke Xu1C, Jing Ai1F, Xinyu Fang3E, Naiyang Shi2C, Haodi Huang1D, Ying Wu1B, Zhihang Peng3B, Jianli Hu1C, Liguo Zhu1F, Changjun Bao14A*, Ming Wu15AGDOI: 10.12659/MSM.929986
Med Sci Monit 2021; 27:e929986
Table 1 Transmission characteristics and key time intervals in 4 stages of confirmed COVID-19 cases reported in Jiangsu Province, Eastern China, by March 20, 2020 (n=631).
| Stage | Stage 1 (n=21) | Stage 2 (n=236) | Stage 3 (n=236) | Stage 4 (n=138) | Total (n=631) |
|---|---|---|---|---|---|
| The first generation infectiona | 71.43% (15) | 64.41% (152) | 36.02% (85) | 18.12% (25) | 43.90% (277) |
| The second generation infectionb | 23.81% (5) | 20.34% (48) | 28.39% (67) | 24.64% (34) | 24.41% (154) |
| The third generation infectionc | 4.76% (1) | 14.83% (35) | 35.17% (83) | 55.80% (77) | 31.07% (196) |
| Uncleard | 0.00% (0) | 0.42% (1) | 0.42% (1) | 1.45% (2) | 0.63% (4) |
| Onset-to-diagnosis | 11.00 (10.00–12.50) | 8.00 (5.00–10.75) | 6.00 (4.00–10.00) | 5.00 (3.00–7.00) | 7.00 (4.00–10.00) |
| Onset-to-first medical visit | 5.00 (3.00–7.00) | 2.00 (0.00–4.00) | 1.00 (0.00–3.75) | 1.00 (0.00–3.00) | 1.00 (0.00–4.00) |
| Onset-to-hospitalization | 8.00 (6.50–9.00) | 5.00 (1.25–7.00) | 3.00 (0.00–5.00) | 1.00 (0.00–3.25) | 3.00 (1.00–6.00) |
| a The first generation infection was defined as those who had the history of travel and residence of Wuhan city and surrounding areas or other communities with reported cases; b The second generation infection was defined as those who had contacted people from Wuhan city and surrounding areas or other communities with reported cases; c The third generation infection was defined as those who had contacted a locally confirmed or probable COVID-19 case; d Unclear defined as cases that did’t belong to the above three categories and whose exposure sources cannot be traced. | |||||