inclusion criteria: - exposure to a covid-19-infected individual in the same household within five days of diagnosis; - age >18 years; - ability to give informed consent to participate in a clinical study; - ability to swallow oral medications; - access to a smartphone

inclusion criteria: - exposure to a covid-19-infected individual in the same household within five days of diagnosis; - age >18 years; - ability to give informed consent to participate in a clinical study; - ability to swallow oral medications; - access to a smartphone