Trump still contagious? Experts say it's impossible to know

President Donald Trump said Thursday he doesn't think he's contagious anymore, but medical experts say that's impossible to know a week after his diagnosis with COVID-19.Most people with COVID-19 can stop isolating and be around others about 10 days after they first showed symptoms, according to the Centers for Disease Control and Prevention.“At this point, there’s no diagnostic test that tells you whether a person that’s infected remains infectious,” said Dr. Benjamin Pi