inclusion criteria: * subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: * subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: subjects must meet the following criteria to be included in the study: male or females between 18 -80 years of age at the time of consent able to provide informed consent. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: subjects must meet the following criteria to be included in the study: male or females between 18 -80 years of age at the time of consent able to provide informed consent. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: - subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: - subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard real time polymerase chain reaction (rt-pcr) assay or immunoglobin m/g (igm/igg) rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: - subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard rt-pcr assay or igm/igg rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)

inclusion criteria: - subjects must meet the following criteria to be included in the study: 1. male or females between 18 -80 years of age at the time of consent 2. able to provide informed consent. 3. prior confirmed covid-19 diagnosis by standard rt-pcr assay or igm/igg rapid serological test at least 4 weeks prior to screening visit. 4. ambulatory patients may be attending covid long term follow up clinic or discharged from hospital for at least one week. 5. evidence of new and/or persistent respiratory symptoms at least 4 weeks after the onset of acute covid-19 infection. this will be determined by history of respiratory symptoms: cough, wheeze, limitation of activities. 6. able to perform an exercise of moderate activity e.g., walking up a hill or climbing stairs (required to assess borg rpe) 7. able to walk unaided for a minimum distance of 10 meters (distance validated for completion of 6-minute walk test)