Where they did, we only included breakthrough hospitalizations and deaths due to COVID-19. However, few states made these distinctions. DC, for example, reports that as of July 11, 50% of hospitalized breakthrough cases were due to COVID-19, 19% were not, and 31% were of unknown reason. States differ in whether they provide this detail. The CDC reports that as of July 19, of 5,601 hospitalized breakthrough cases, 27% were asymptomatic or not related to COVID-19 and of 1,141 fatal cases, 26% were asymptomatic or not related to COVID-19. Importantly, not all hospitalizations and deaths of those fully vaccinated and diagnosed with COVID-19 are due to COVID-19 or have a known cause at the time of reporting. Department of Health & Human Services for the appropriate period (see methods for more detail). Where a state did not provide comparable data on overall COVID-19 cases, hospitalizations, or deaths reported over the period in which it captured breakthrough events, we obtained data on cases and deaths from the Johns Hopkins University COVID-19 Dashboard and on hospitalizations from the U.S. We only used data from official state sources (we did not include data available only in news media reports, for example). to see which are providing data on COVID-19 breakthrough cases, hospitalizations and deaths, how regularly, and what those data may tell us. We therefore reviewed the websites and other official state sources for all 50 states and D.C. CDC presents this data in aggregate at the national level but not by state, and there is no single, public repository for data by state or data on breakthrough infections, since the CDC stopped monitoring them. The Centers for Disease Control and Prevention (CDC) currently monitors hospitalizations and deaths, from any cause, among fully vaccinated individuals with COVID-19, but not breakthrough infections, which it stopped monitoring as of May 1. These rare occurrences are known as “breakthrough cases” which are to be expected, and historically known to occur with other vaccines as none is 100% effective. While COVID-19 vaccines are highly effective at preventing severe disease, hospitalization, and death from COVID-19 and also reduce the likelihood of mild or asymptomatic infection, a small share of fully vaccinated individuals do become infected, and some become hospitalized or have died.
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