Estimating the number of probable new SARS-CoV-2 infections among tested subjects from the number of confirmed cases

Table 1 Prior knowledge on the sensitivities and specificities of the tests used for the diagnosis of SAR-Cov-2 infection

Test characteristic	Prior interval	Prior parameters of beta distributions
Test characteristic	Prior interval	Alpha	Beta
RT-PCR sensitivity	50–91%	13.25	5.54
IgM test sensitivity ^a	24–44%	30.18	58.58
IgM test specificity	94–100%	124.48	3.85
IgM and IgG test sensitivity ^b	23–97%	3.61	2.40
IgM and IgG test specificity ^b	81–100%	33.58	3.52

^a Sensitivity of the test in diagnosing recent infections
^b IgM and IgG test: positive result when IgM + or IgG+, negative result when IgM– and IgG–.

ISSN: 1471-2288