Table 1.
A sample of keywords that were tracked during this release (v2.45; May 3, 2021).
| Keyworda | Tracked since |
| Coronavirus | January 28, 2020 |
| CDC | January 28, 2020 |
| Wuhanlockdown | January 28, 2020 |
| Kungflu | January 28, 2020 |
| corona virus | March 2, 2020 |
| covid | March 6, 2020 |
| covid19 | March 6, 2020 |
| sars-cov-2 | March 6, 2020 |
| COVID–19 | March 8, 2020 |
| coronapocalypse | March 13, 2020 |
| SocialDistancing | March 13, 2020 |
| shelteringinplace | March 18, 2020 |
| flatten the curve | March 18, 2020 |
aWe do not need to track every permutation of a keyword. As of this writing, Twitter returns all tweets that contain the keyword as a substring, and it is case insensitive.