Any test will have false negatives, and there's indication that the false negative for the COVID RT-PCR test is really quite high. A negative test should not be

Any test will have false negatives, and there's indication that the false negative for the COVID RT-PCR test is really quite high. A negative test should not be considered probative. COVID-19 is not known to persist for a long time, however, and lingering symptoms are not necessarily a sign of lingering infection. Most likely they are a result of damage rather than illness, or perhaps ongoing immune response.