Table 2 Pandemic stage division.
Stage | First Wave | Under Control |
|---|---|---|
Periods | 2020/1/20–2020/4/28 | 2020/4/29–2021/5/20 |
Case variation |
|
|
Spatial feature |
|
|
Typical city | Wuhan had the highest number of new cases during this stage, and other cities in Hubei Province as well as cities in neighboring provinces, were also affected. | Sporadic outbreaks have occurred in major cities such as Shanghai, Shijiazhuang, Guangzhou, and Beijing, as well as in some border cities, with some randomization. |
Stage | Delta | Omicron |
Periods | 2021/5/21–2021/12/15 | 2021/12/16–2022/12/06 |
Case variation |
|
|
Spatial feature |
|
|
Typical city | The first case of Delta strain was found in Guangzhou, while more new cases were reported in Shanghai. Overall, cases have not yet increased significantly. | The first case of Omicron strain appeared in Tianjin, with outbreaks of cases growing in Shanghai, Guangzhou, Changchun, Beijing and Jilin, and significantly increased in other major cities. |
