inclusion criteria: * age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old * no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days * have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening * have not had close contact with a person with a laboratory confirmed case of covid-19 without full ppe (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a total of 15 minutes or more over a 24 hour period) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days * mayo clinic patient who has a patient online account set up or is willing to set up an online account * must have a valid email address and internet service

inclusion criteria: * age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old * no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days * have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening * have not had close contact with a person with a laboratory confirmed case of covid-19 without full ppe (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a total of 15 minutes or more over a 24 hour period) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days * mayo clinic patient who has a patient online account set up or is willing to set up an online account * must have a valid email address and internet service

inclusion criteria: - age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old - no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days - have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening - have not had close contact with a person with a laboratory confirmed case of covid-19 without full ppe (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a total of 15 minutes or more over a 24 hour period) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days - mayo clinic patient who has a patient online account set up or is willing to set up an online account - must have a valid email address and internet service

inclusion criteria: - age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old - no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days - have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening - have not had close contact with a person with a laboratory confirmed case of covid-19 without full ppe (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a total of 15 minutes or more over a 24 hour period) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days - mayo clinic patient who has a patient online account set up or is willing to set up an online account - must have a valid email address and internet service

inclusion criteria: - age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old - no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days - have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening - have not had close contact with a person with a laboratory confirmed case of covid-19 (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a prolonged period of time (more than 5 minutes) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days - mayo clinic patient who has a patient online account set up or is willing to set up an online account - must have a valid email address and internet service

inclusion criteria: - age ≥50 years old or primary healthcare professional (defined as having a job that has had direct patient contact during the covid-19 pandemic) and ≥18 years old - no symptoms of covid-19 (a fever of 100.0o f or greater, or a new cough, or new shortness of breath, or new sore throat, or new diarrhea, or new fast breathing (respiratory distress), or new chills, or new muscle aches (myalgias), or new loss of smell, or new change or loss of taste sensation) in the past 7 days - have a negative elecsys anti-sars-cov-2 immunoassay antibody test at screening - have not had close contact with a person with a laboratory confirmed case of covid-19 (close contact is defined by cdc as: being within approximately 6 feet of a covid-19 patient for a prolonged period of time (more than 5 minutes) or having direct contact with infectious secretions of a covid-19 patient (e.g. being coughed on)) in the last 14 days - mayo clinic patient who has a patient online account set up or is willing to set up an online account - must have a valid email address and internet service