The next day, as his cold symptoms seemed to worsen, he went to the local public health center for a polymerase chain reaction (PCR) test but was told to go home since the self-test kit showed ...

People with asymptomatic or mild COVID illness generally test negative after nine days, but a polymerase chain reaction (PCR) ...

As the nation experiences what many experts believe is the second-largest wave of COVID infections since the pandemic started, many Americans will be checking to make sure they don’t have the ...