RE:RE:RE:. The reason for the nasal swab is the virus will be detected earlier in the nasal cavity than the saliva resulting in earlier detection.
A saliva test that is negative does not mean your negative or for many of the rapid tests as noted on their FDA sheets..
In a scientific article published in the journal Cell, scientists at the UNC Gillings School of Global Public Health and the UNC School of Medicine have characterized the specific ways in which SARS-CoV-2 — the coronavirus that causes COVID-19 — infects the nasal cavity to a great degree by replicating specific cell types, and infects and replicates progressively less well in cells lower down the respiratory tract, including in the lungs.
The findings suggest the virus tends to become firmly established first in the nasal cavity. Then, in some cases, the virus is aspirated into the lungs where it may cause more serious disease, including potentially fatal pneumonia.
https://sph.unc.edu/sph-news/researchers-map-how-coronavirus-infection-travels-through-cells-of-nasal-cavity-and-respiratory-tract/ Dude51 wrote: One more note all tests on Dr Oz were done buy swab up the nose and none were done in 15 minutes.