Table 1.
The most significant 12 vaccine-related topics and the percentage of tweets in each topic (N=7,948,886).
| Topic ID | Topic label | Topic totals, n (%) |
| 1 | Vaccination of frontline workers | 690,357 (8.7) |
| 2 | Access to vaccines, signing up online | 658,115 (8.3) |
| 3 | South African variant | 593,425 (6.8) |
| 4 | Biden stimulus plan | 540,065 (3.7) |
| 5 | mRNA vaccines | 292,217 (3.2) |
| 6 | Complaints about pharmaceutical company profits | 250,337 (3.1) |
| 7 | Vaccine conspiracy theories online | 243,934 (2.9) |
| 8 | Trials in non-mRNA vaccines | 232,780 (2.5) |
| 9 | Vaccine distribution in Canada | 202,164 (2.5) |
| 10 | Supply and herd immunity | 198,967 (2.5) |
| 11 | Genetic concerns about vaccines and kids | 194,578 (2.2) |
| 12 | Low distribution of AstraZeneca vaccine | 189,468 (2.1) |