Adjusted and Unadjusted Flu Vaccine Doses Distributed: 2018-2019 – 2021-2022
In order to improve data reporting for flu vaccine distribution, changes were made to the reporting intervals for the current season. This required the totals for the last four seasons worth of historical data to be adjusted for comparability.
| Flu season | Original Total (millions) | Revised Total (millions) |
| 2021-2022 | 174.9 | 175.6 |
| 2020-2021 | 193.8 | 194.4 |
| 2019-2020 | 174.5 | 175.2 |
| 2018-2019 | 169.1 | 170.7 |
