Cases of COVID-19 vaccine breakthrough confirmed in Washington state

OLYMPIA–The Washington State Department of Health (DOH) is investigating reports of people in the state who tested positive for COVID-19 more than two weeks after being fully vaccinated. Scientists call these "vaccine breakthrough" cases, which are expected with any vaccine.

Large-scale clinical studies found that COVID-19 vaccines reduced the risk of getting COVID-19 in vaccinated people by up to...