Table 7. Secondary testing of field samples for SARS-CoV-2.

For our PSCS-CoV2 method, a positive was a sample with N1 < 40 and a N2 < 40. Samples that did not meet that threshold were deemed negative. Retests were performed by an independent Clinical Laboratory Improvement Amendments (CLIA) approved laboratory using nasopharyngeal swabs for sample collection.

Category	Initially tested positive (PSCS-CoV2)	Re-tested positive	Percent agreement
N1 < 30	12	10	83.3
N1 > 30	8	1	12.5
Category	Initially tested negative (PSCS-CoV2)	Re-tested negative	Percent agreement
N1 > 30	3	3	100