Depends on who’s doing the testing, what the definitions are and the accuracy.
the article states this nurse was tested 5 times and came back negative. Succesfully tested positive on the sixth try.
Last week 77 NFL players all tested positive in the morning and practices were cancelled.
Amazingly, that very same evening they tested negative.
Governor Dewine tested positive a week ago and later that day tested negative
Amazing!!!
The traditional US test for COVID-19 (the nasal swab PCR test) has a high false negative score in the first few days of infection. There isn’t enough viral material yet in most cases to get a good result. It’s also subject to extended positive tests due to lingering noninfectious viral proteins remaining in a recovered patient’s system for sometimes weeks after the infection has cleared.
Hopefully the Yale saliva test that was recently approved provides a clearer picture and is less subject to collection errors and contamination issues.