Table 1.

Inclusion and exclusion criteria. General inclusion criteria apply for symptomatic as well as symptomatic participants, while specific inclusion criteria apply for the group stated. * Coronavirus disease 2019 (COVID-19) symptoms included fever, cough, sore throat, fatigue, general feeling of weakness, loss of smell or taste, shortness of breath, muscle stiffness, body aches, head cold, running nose, and others such as diarrhea or vomiting.

		Inclusion Criteria	Exclusion Criteria
General		≥18 years old Written informed consent Preexisting indication for Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) testing, i.e., COVID-19 symptoms *, known or suspected exposure to SARS-CoV-2, screening	<18 years old Unable or unwilling to provide informed consent No preexisting indication for SARS-CoV-2 testing Pregnant or breast-feeding women Involuntarily held in an institution Bleeding disorder Application of nasal spray prior to testing on the day of testing Hospitalization/ inpatient treatment
Specific	Asymptomatic	Asymptomatic during the previous 14 days	COVID-19 symptoms during the previous 14 days
	Symptomatic	COVID-19 symptoms on the testing day Symptom onset 0–7 days prior to testing day	Symptom onset > 7 days prior to testing day