study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant is a healthcare worker or is a person at risk of contracting covid-19. 7. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant is a healthcare worker or is a person at risk of contracting covid-19. 7. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals adults (exact age is dependent on countries) less than 70 years old at the time of consent not previously diagnosed with covid-19 not currently symptomatic with an ari participant is a healthcare worker or is a person at risk of contracting covid-19. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals adults (exact age is dependent on countries) less than 70 years old at the time of consent not previously diagnosed with covid-19 not currently symptomatic with an ari participant is a healthcare worker or is a person at risk of contracting covid-19. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant is a healthcare worker or is a person at risk of contracting covid-19. 7. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other persons defined by the site investigator at risk of contracting covid-19. inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant is a healthcare worker or is a person at risk of contracting covid-19. 7. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other staff working in a facility where there are cases of either proven or suspected covid-19 inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant works in a facility where there are cases of either proven or suspected covid-19 7. possesses an internet-enabled smartphone (android or ios)

study participants the study population is adult healthcare workers and other staff working in a facility where there are cases of either proven or suspected covid-19 inclusion criteria 1. participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct 2. agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals 3. adults (exact age is dependent on countries) less than 70 years old at the time of consent 4. not previously diagnosed with covid-19 5. not currently symptomatic with an ari 6. participant works in a facility where there are cases of either proven or suspected covid-19 7. possesses an internet-enabled smartphone (android or ios)