Swabs are the most reliable test you can perform to identify any positives. After any initial screening with rapid swabs, you can do a more thorough screening with the molecular swab. The nasal/oropharyngeal swab allows you to perform the molecular test that detects the presence of SARS-CoV-2 virus by taking a mucus sample from the patient's airway. The sample is then analyzed in the laboratory for SARS-CoV-2 virus, which is responsible for COVID-19 disease. The test requires taking the mucus that lines the surface cells of the mucosa of the nasopharynx (the upper part of the pharynx canal). This is done using a cotton swab that is inserted into each nostril of the patient.