You have the telltale signs of COVID — fever, headache, dry cough and exhaustion — but your rapid antigen test is returning a negative result ... of the test will impact accuracy.

If the virus has not replicated to a high enough level in that part of your body, a test will be negative ... testing can reduce the impact of Covid-19 on all of our lives in the coming months.

CNN: Many people believe they have symptoms of Covid-19 but are testing negative. Why does that happen? Dr. Leana Wen: There are several possibilities. First, Covid-19 often presents like other ...