Delaware confirmed a second case of measles Tuesday, just one day after confirming the first positive test in more than a decade. Case confirmed in Kent CountyBoth cases are in unvaccinated adult males in Kent County, according to the Delaware Division of Public Health. If records are inaccessible through the portal, people should contact their primary health care provider. “The MMR vaccine is proven safe and effective at preventing measles, having been administered for over five decades,” DPH said in a statement. “Testing shows the MMR vaccine to be 97% effective at preventing measles for those who have received two doses of the MMR vaccine and are not severely immunocompromised.”