inclusion criteria: - written informed consent - age ≥ 65 years - mild to moderate symptomatic respiratory tract infection defined as not requiring hospital admission: spo2 >94%, respiratory rate <20, mental state alert, no signs of septic shock - proven sars-cov2 infection by throat swab (pcr) - onset of symptoms within the last 3 days before randomization - must be able to adhere to the study visit schedule and other protocol requirements in the investigator's opinion. i.e. must be able to answer to questions concerning symptoms and side effects and must be able to consent to the informed consent.

inclusion criteria: - written informed consent - age ≥ 65 years - mild to moderate symptomatic respiratory tract infection defined as not requiring hospital admission: spo2 >94%, respiratory rate <20, mental state alert, no signs of septic shock - proven sars-cov2 infection by throat swab (pcr) - onset of symptoms within the last 3 days before randomization - must be able to adhere to the study visit schedule and other protocol requirements in the investigator's opinion. i.e. must be able to answer to questions concerning symptoms and side effects and must be able to consent to the informed consent.