Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Segmentation of COVID-19 data into epidemic waves.
| Wave | Date range | Description |
|---|---|---|
| Wave 1 | 2020-03-01 to 2020-06-30 | Initial outbreak and first lockdowns |
| Wave 2 | 2020-09-01 to 2021-02-28 | Winter surge and Alpha variant rise |
| Wave 3 | 2021-03-01 to 2021-07-31 | Alpha and Delta variant wave |
| Wave 4 | 2021-08-01 to 2021-12-31 | Continued Delta variant surge |
| Wave 5 | 2022-01-01 to 2022-06-30 | Omicron BA.1 wave |
| Wave 6 | 2022-07-01 to 2022-12-31 | Omicron BA.4/BA.5 wave |
