For people who are fully vaccinated, the risk of being hospitalized or death due to COVID-19 is low, and way lower than the risk for unvaccinated people. However, in rare cases of a fully vaccinated individual getting infected, older adults and those with several underlying conditions have the highest risk of serious illness, suggest data.

As of August 30, 12,908 severe breakthrough cases of COVID-19 have been reported to the US Centers for Disease Control and Prevention among fully vaccinated individuals that led to hospitalization or death. The data suggests a less than a 1 in 13,000 chance of having a severe breakthrough case of COVID-19. The data also suggest that nearly 70% of breakthrough cases resulting in hospitalization were seen in those aged 65 years and older and about 87% of breakthrough cases culminating in death were observed among those 65 years of age and older… (CNN, September 8, 2021)