evidence: The share of COVID-19 deaths among those who are vaccinated has risen. In fall 2021, about 3 in 10 adults dying of COVID-19 were vaccinated or boosted. But by January 2022, as we showed in an analysis posted on the Peterson-KFF Health System Tracker, about 4 in 10 deaths were vaccinated or boosted. By April 2022, the United States Centers for Disease Control and Prevention (CDC) data show that about 6 in 10 adults dying of COVID-19 were vaccinated or boosted, and that’s remained true through at least August 2022 (the most recent month of data). The data from this chart come from the CDC, which collects data on the number of deaths by vaccination status from 30 health departments (including states and cities) across the country. In order to be counted as vaccinated, a person must be at least two weeks out from completing their primary series before testing positive (for example, at least 14 days after completing two doses of the mRNA vaccine). Similarly, to be counted as having a booster, a person must be at least two weeks out from their booster or additional dose before testing positive. People who were partially vaccinated are not included in this data. [...] There are several factors at play here, including a rising share of the population that is vaccinated, waning immune protection and low uptake of boosters, and changes in immunity among the unvaccinated. New variants combined with a reduction in masking and other non-pharmaceutical interventions may also lead to more transmission, which can in turn lead to more deaths.