18 Years to 80 years old Both genders Having household contact or contact in less than 1.5 meters for more than one hour, or exposed without facemask with a COVID-19 case confirmed with RT-PCR or with clinical or radiographic evidence of pneumonia, acute respiratory distress syndrome (ARDS) Free of the COVID-19 disease symptoms (fever, cough, dyspnea, difficulty breathing, sore throat, severe fatigue, headache, GI symptoms) Free from chronic respiratory or other illnesses with symptoms confused with symptoms of COVID-19 disease Signed consent form

18 Years to 80 years old Both genders Having household contact or contact in less than 1.5 meters for more than one hour, or exposed without facemask with a COVID-19 case confirmed with RT-PCR or with clinical or radiographic evidence of pneumonia, acute respiratory distress syndrome (ARDS) Free of the COVID-19 disease symptoms (fever, cough, dyspnea, difficulty breathing, sore throat, severe fatigue, headache, GI symptoms) Free from chronic respiratory or other illnesses with symptoms confused with symptoms of COVID-19 disease Signed consent form