COVID-19 saliva test versus nasopharyngeal swabbing
My impression is that the nasopharyngeal swabbing is more likely to pick up traces of the virus in the early stages.
I'm guessing that if it lands in your mouth, the various enzymes and such are likely to digest and destroy it.
If it lands in your nose, your nose hairs are there to slow its passage to your lungs, but may be less likely to kill it.
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I ran a fever and felt bad the first week of February and went to a Minute Clinic.
The Minute Clinic gave me both nasal and throat swabs, and told me within five minutes that I had Influenza A, and that I didn't have strep throat. This told me to quarantine, and that no antibiotic was needed.
It would be nice to have a Covid test that was as quick.