It not a typo, it's a (single) incorrect test result, probably due to contamination, operator error, noise, or expected defects in testing supplys. (It might be

It not a typo, it's a (single) incorrect test result, probably due to contamination, operator error, noise, or expected defects in testing supplys. (It might be some other coronavirus (there are plenty). It theoretically might be COVID-19, but as you note, that's incredibly unlikely.)