The test can sometimes show a negative result even if you are infected with SARS-CoV-2, the virus that causes COVID-19, or infected with Influenza A and/or Influenza B, or infected with RSV. This can happen if:
It is too early in infection for the test to detect the virus.
There was a problem with your sample or the test itself.
If your results are negative and you’re having symptoms, continue to follow isolation
precautions and ask your healthcare provider if you need further testing.
If your results are negative and you don’t have any symptoms, continue to monitor for any
symptoms up to 14 days after your last possible exposure.