Inclusion Criteria:  Groups of patients who volunteer at the institution to have laboratory testing or laboratory sampling who  present with symptoms of mild respiratory infection and have these symptoms for no more than 96 hours are at least 18 years old have requested and have had standard laboratory tests, blood sampling or SARS-CoV sampling provided by the institution in accordance with the institution's procedures, entered evaluable responses at least three times on the standard online health questionnaires provided by the institution, participated in at least 2 SARS CoV-2 sampling tests, and for whom no such clinical condition or other reason was identified during the data review and assessment by the principal investigator that could affect the integrity of the data  Exclusion Criteria:  Subjects will be excluded from the analysis who:  Have symptoms suggestive of moderate to severe condition:  breathing rate: > 21/min AND/OR extra oxygen demand (e.g. peripheral oxygen saturation measured on site <96%) AND/OR clinical or radiological signs of pneumonia, or other conditions considered severe by the specialist, clinician or requiring hospitalization or were also hospitalized in connection with the COVID-19 disease Have infection-specific or COVID-19 disease-specific symptoms for more than 96 hours when first presenting, or Have a history of chronic ethyl consumption or smoking >20 cigarettes per day, or suspected COPD