Now, the saliva includes much of the Immunoglobulin A and some digestive enzymes and may be other substances.
Beasts lick their wounds as it is known.
When saliva is defective, the mouth will corrupt: the soft palate will be destroyed .. etc.
So the mouth wash and frequent gargling should be among the routine preventive measures together with other hygiene like washing the hands etc.
Therefore, increasing the saliva secretion may be useful to prevent this Coronavirus.
How we increase the saliva :
By the chewing gum, especially the bitter Arab chewing gum produced in Yemen, Sudan and other countries.. the bitter taste is more effective in increasing the secretion of the saliva.
If not available then the Iranian natural chewing gum,
and if not available take any chewing gum.
This is only my personal opinion, it could be correct or wrong. God is the All-Knowing.
My preferable website of the Qran interpretation: