Saliva test could offer new way to check immunity
The researchers found that in general, higher antibody concentrations in serum were associated with higher concentrations in saliva, with the strongest relationships observed for IgA antibodies.
While these preliminary results cannot yet be used to inform clinical decisions at an individual level, they suggest that measuring antibodies in saliva may have promise in future epidemiological studies relating to vaccination against bacterial infections, particularly in developing countries...

http://medicalxpress.com/news/2016-12-saliva-immunity.html
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