1. informed consent must be obtained from the subject before any assessment is performed. 2. adults (male and female) aged 65 years and over who are asymptomatic but: 1. have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or 2. live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . 3. sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. 4. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly

1. informed consent must be obtained from the subject before any assessment is performed. 2. adults (male and female) aged 65 years and over who are asymptomatic but: 1. have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or 2. live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . 3. sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. 4. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly

informed consent must be obtained from the subject before any assessment is performed. adults (male and female) aged 65 years and over who are asymptomatic but: have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly

informed consent must be obtained from the subject before any assessment is performed. adults (male and female) aged 65 years and over who are asymptomatic but: have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly

1. informed consent must be obtained from the subject before any assessment is performed. 2. adults (male and female) aged 65 years and over who are asymptomatic but: 1. have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or 2. live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . 3. sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. 4. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly

1. informed consent must be obtained from the subject before any assessment is performed. 2. adults (male and female) aged 65 years and over who are asymptomatic but: 1. have sars-cov-2 detected during surveillance nasal or nasopharyngeal swab testing or 2. live in the same house or apartment as someone who has laboratory-confirmed symptomatic covid-19 . 3. sexually active male subjects with a partner of child-bearing potential must be willing to wear a condom while on study drug and for 1 week after stopping study drug and should not father a child in this period. a condom is required to be used also by vasectomized men with a partner of child-bearing potential to prevent delivery of the drug via seminal fluid. 4. subject must be able to understand and comply with the requirements of the study including having internet access and an email account, willingness to answer an ediary questionnaire on a personal electronic device each night, and willingness to answer the telephone questionnaires twice weekly