"It's a waste of resources." Long after COVID patients stop being contagious, their body continues to slough off fragments of dead virus cells, sometimes triggering a "positive" reading from COVID ...

Even before Candace Palmerlee tested positive for the coronavirus, she began isolating herself at home, not wanting to pass the infection on to others. When her positive test result was confirmed on ...

A new study out of South Korea suggests that people who test positive for COVID-19 a second time may no longer be contagious. For the study, published Tuesday by South Korea's Centers for Disease ...

RSV is usually contagious for three to eight days. A patient also may be contagious a day or two before experiencing symptoms, the CDC said. Infants and those with weakened immune systems, however, ...

Those infected with the flu are most contagious during the first three days, the CDC said. In some cases, however, people can ...

Studies have shown that people may be contagious for about two days before developing COVID-19 symptoms. In fact, right before developing symptoms is when people are likely the most contagious, said ...

The tool tells Americans how long to stay home and when to get tested. The Centers for Disease Control and Prevention released an online calculator Thursday to help people determine if they should ...