* inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: * male or female, aged 18 to 80 years * previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. * presence of physical limitations or significant fatigue since covid-19 as demonstrated by: * total score \<= 19 on the promis short form for physical function or total score \>= 9 on the promis short form for fatigue, and * score \>= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities * absence of post-exertional malaise (pem) as identified on the dsq-pem where: * items 1 to 5 has no score \>= 2 for frequency and no score \>= 2 for severity, occurring in the same row, and * item 7 or 8 is no , and * item 9 is \<= 13 hours * able to read, speak and understand english or spanish * able to understand and willing to sign a written informed consent document * willing and able to complete study procedures

* inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: * male or female, aged 18 to 80 years * previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. * presence of physical limitations or significant fatigue since covid-19 as demonstrated by: * total score \<= 19 on the promis short form for physical function or total score \>= 9 on the promis short form for fatigue, and * score \>= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities * absence of post-exertional malaise (pem) as identified on the dsq-pem where: * items 1 to 5 has no score \>= 2 for frequency and no score \>= 2 for severity, occurring in the same row, and * item 7 or 8 is no , and * item 9 is \<= 13 hours * able to read, speak and understand english or spanish * able to understand and willing to sign a written informed consent document * willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score <= 19 on the promis short form for physical function or total score >= 9 on the promis short form for fatigue, and score >= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities absence of post-exertional malaise (pem) as identified on the dsq-pem where: items 1 to 5 has no score >= 2 for frequency and no score >= 2 for severity, occurring in the same row, and item 7 or 8 is no , and item 9 is <= 13 hours able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score <= 19 on the promis short form for physical function or total score >= 9 on the promis short form for fatigue, and score >= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities absence of post-exertional malaise (pem) as identified on the dsq-pem where: items 1 to 5 has no score >= 2 for frequency and no score >= 2 for severity, occurring in the same row, and item 7 or 8 is no , and item 9 is <= 13 hours able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study, as specified in section 8.1. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti30 nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score <= 19 on the promis short form for physical function or total score >= 9 on the promis short form for fatigue, and score >= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities absence of post-exertional malaise (pem) as identified on the dsq-pem where: items 1 to 5 has no score >= 2 for frequency and no score >= 2 for severity, occurring in the same row, and item 7 or 8 is no , and item 9 is <= 13 hours able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study, as specified in section 8.1. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2 at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti30 nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score <= 19 on the promis short form for physical function or total score >= 9 on the promis short form for fatigue, and score >= 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities absence of post-exertional malaise (pem) as identified on the dsq-pem where: items 1 to 5 has no score >= 2 for frequency and no score >= 2 for severity, occurring in the same row, and item 7 or 8 is no , and item 9 is <= 13 hours able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2, at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2, at least 4 weeks prior to enrollment, confirmed by laboratory or a healthcare provider. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2, confirmed by laboratory or a healthcare provider-administered test at least 4 weeks prior to enrollment. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous infection with sars-cov2, confirmed by laboratory or a healthcare provider-administered test at least 4 weeks prior to enrollment. participants with a documented positive home antigen test will need confirmation of positive covid-19 antibodies (positive anti-nucleocapsid antibody test, or positive anti-spike antibody test if unvaccinated at the time of the antibody test) to be considered. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 at least 4 weeks prior to enrollment presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 at least 4 weeks prior to enrollment presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 considered non-infectious with covid-19 as demonstrated by: greater than or equal to 28 days since initial onset of symptoms or initial positive test date, (for asymptomatic infection), and greater than or equal to 72 hours since resolution of fever (without fever-reducing medication), and symptoms (e.g. cough, shortness of breath) have improved, or greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: male or female, aged 18 to 80 years previous laboratory-confirmed infection with sars-cov2 considered non-infectious with covid-19 as demonstrated by: greater than or equal to 28 days since initial onset of symptoms or initial positive test date, (for asymptomatic infection), and greater than or equal to 72 hours since resolution of fever (without fever-reducing medication), and symptoms (e.g. cough, shortness of breath) have improved, or greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 presence of physical limitations or significant fatigue since covid-19 as demonstrated by: total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities able to read, speak and understand english or spanish able to understand and willing to sign a written informed consent document willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 3. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days sinceinitial onset of symptoms or initial positive test date, (for asymptomatic infection), and greater than or equal to 72 hours since resolution of fever (without fever-reducing medication), and symptoms (e.g. cough, shortness of breath) have improved, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 4. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 5. able to read, speak and understand english or spanish 6. able to understand and willing to sign a written informed consent document 7. willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 3. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days sinceinitial onset of symptoms or initial positive test date, (for asymptomatic infection), and greater than or equal to 72 hours since resolution of fever (without fever-reducing medication), and symptoms (e.g. cough, shortness of breath) have improved, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 4. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 5. able to read, speak and understand english or spanish 6. able to understand and willing to sign a written informed consent document 7. willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 3. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days since initial positive test date, and greater than or equal to 7 days since resolution of fever (without fever-reducing medication), and symptoms have improved, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 4. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 5. able to read, speak and understand english or spanish 6. able to understand and willing to sign a written informed consent document 7. willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 3. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days since initial positive test date, and greater than or equal to 7 days since resolution of fever (without fever-reducing medication), and symptoms have improved, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 4. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 5. able to read, speak and understand english or spanish 6. able to understand and willing to sign a written informed consent document 7. willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 and was hospitalized due to covid-19 3. up to 12 months since initial positive sars-cov2 test date 4. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days since initial positive test date, and greater than or equal to 7 days since resolution of fever (without fever-reducing medication), and greater than or equal to 7 days since resolution of respiratory symptoms, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 5. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 6. able to read, speak and understand english or spanish 7. able to understand and willing to sign a written informed consent document 8. willing and able to complete study procedures

- inclusion criteria: screening procedures will be performed as part of this study. in order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. male or female, aged 18 to 80 years 2. previous laboratory-confirmed infection with sars-cov2 and was hospitalized due to covid-19 3. up to 12 months since initial positive sars-cov2 test date 4. considered non-infectious with covid-19 as demonstrated by: 1. greater than or equal to 28 days since initial positive test date, and greater than or equal to 7 days since resolution of fever (without fever-reducing medication), and greater than or equal to 7 days since resolution of respiratory symptoms, or 2. greater than or equal to 10 days since initial positive test date, and at least 2 consecutive nasopharyngeal or oropharyngeal swabs collected greater than or equal to 24 hours apart that are negative for sars-cov2 5. presence of physical limitations or significant fatigue since covid-19 as demonstrated by: 1. total score less than or equal to 19 on the promis short form for physical function or total score greater than or equal to 9 on the promis short form for fatigue, and 2. score greater than or equal to 1 on the patient global rating of flu severity and patient global assessment of interference with daily activities 6. able to read, speak and understand english or spanish 7. able to understand and willing to sign a written informed consent document 8. willing and able to complete study procedures