OLYMPIA, Wash. – Less than 1% of fully vaccinated people in Washington have reported breakthrough cases, according to new data from the Washington State Department of Health.

The Department of Health released a report Wednesday that shows 36,919 COVID-19 breakthrough cases were reported between Jan. 17, 2021 and Sept. 11, 2021.

Of the breakthrough cases, 88% reported symptoms, 9% were hospitalized, and less than 1% (331 people) died from COVID-19 related illness.

A majority of breakthrough cases were reported in people age 35-49 years old.

The health department says of the people who died, 168 were known to have one or more underlying health conditions. Information was not available for the other 161 people.

The median age of those who died was 79 years old.

The state health department classifies breakthrough cases as testing positive for coronavirus at least 14 days after a person received their last recommended dose of an authorized COVID-19 vaccine.