Yes but the FN rate varies strongly with the viral load in the sample. If you are shedding a lot of virus you will almost always test positive. It’s possible

Yes but the FN rate varies strongly with the viral load in the sample. If you are shedding a lot of virus you will almost always test positive. It’s possible for someone to have it in their body and test negative, but if it’s coming up PCR negative it’s very unlikely that you’ll spread it. Of course, this applies on the day of the test. If you just contracted it, you might test negative and then the viral load goes way up and you spread it a couple of days later.