People, in NPS from whom the rRT-PCR yielded a Ct value for the N gene ≥35, but <40, were informed of the result by the clinicians and were considered for enrollment into the study, if they also fulfilled the below criteria:

No previous diagnosis of COVID-19 (clinical or laboratory findings).

No previous laboratory test found positive for SARS-CoV-2 (molecular or immunological test).

No history of recent contact with a person with confirmed (by laboratory testing) COVID-19.

Before inclusion into the study, all people were informed of the details of the study and expressed their willingness to participate in it. Demographic and medical details for each participant (age, gender, reason for taking the initial NPS, etc.) were obtained by the clinicians.

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