There were 10,262 cases of fully vaccinated people being infected with Covid-19 as of April 30, the CDC said. Less than 7% of the patients were hospitalized with Covid-19 symptoms, and 1.6%, or 160, DIED.
Covid-19 Vaccine Breakthrough Infections Reported to the CDC in the USA from Jan 1 to April 30, 2021.
https://www.cdc.gov/mmwr/volumes/70/wr/mm7021e3.htm