OLYMPIA, Wash. (AP) — The Washington State Department of Health is investigating reports of people in the state who tested positive for COVID-19 more than two weeks after they were fully vaccinated. Scientists call these “vaccine breakthrough” cases, which are expected with any vaccine. Officials said Tuesday that out of 1 million fully vaccinated people in Washington state, epidemiologists report evidence of 102 breakthrough cases in 18 counties since Feb. 1. That represents .01 percent of vaccinated people in Washington. The majority of those experienced only mild symptoms, if any. However, since Feb, 1, officials say eight people with vaccine breakthrough have been hospitalized and officials are investigating potential cases in which two people died.