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President Trump and former Vice President Joe Biden argue what to do about COVID-19 and the pandemic at the first 2020 presidential debate.

USA TODAY

Former Vice President Joe Biden and others around President Trump have tested negative for COVID-19 – but that doesn’t mean they’re totally in the clear, experts said Friday.

A negative test only means someone isn’t shedding much virus at that moment. It doesn’t say anything about what may be brewing in the person’s body. 

Trump, who was known to get tested daily for COVID-19, presumably tested negative on Tuesday, the day of his debate with Biden, which reduces the chance the President passed the virus on to his political opponent.

But even if he tested negative in the morning, it’s still possible he was contagious by the time of the evening debate, said Dr. Michael Mina, an infectious disease epidemiologist at the Harvard T.