Table A3.

Prevalence of COVID-19 equal to 0.36% with sensibility equal 84.2% and specificity equal 98.9%.

	Covid-19
Saliva		Present	Absent
	positive	60	22	82
	negative	12	1906	1918
		72	1928	2000

The numbers reported are based on the sensibility and specificity reported by Pasomsub et al [32]. PPV = 60/82 = 73.2% -> means when the test is positive; the likelihood to have a COVID-19 patient is 73.2%. NPV = 1906/1918 = 99.4% -> means when the test is negative, the likelihood to have a NO COVID-19 patient is 99.4%.