Table A5.

Prevalence of COVID-19 equal to 0.36% with sensibility equal 27% and specificity equal 84.9%.

	Covid-19
Oro-pharyngeal swabs		Present	Absent
	positive	19	292	311
	negative	53	1636	1689
		72	1928	2000

The numbers reported are based on the sensibility and specificity reported by Wang et al [29]. PPV = 19/311 = 6.1% -> means when my test is positive the likelihood to have a COVID-19 patient is 6.1%. NPV = 1636/1689 = 96.9% -> means when my test is negative the likelihood to have a NO COVID-19 patient is 96.9%.