Preliminary studies suggest that COVID-19 causes long-term lung damage, even in young,otherwise healthy people who did not need to go to hospital or the ICU.We seek to know how common long-term lung damage after COVID-19 is, who is most affectedby it and what the effects of this damage are on other important aspects of people'slives. We plan to study a large sample of people with a history of COVID-19 infectionfrom across Canada-some who needed hospitalization but most who did not. Through onlinequestionnaires, we will determine their respiratory symptoms, quality of life and medicalhistory. Then we will invite them to one of our thirteen Canadian testing centres to havespecial, thorough breathing tests.We hypothesize that COVID-19 leaves a significant proportion of people with measurablerespiratory impairment.The information we learn about the effect of COVID-19 on the lungs will help patients andhealth care providers manage it better. It will also reveal how different COVID-19variants affect the lungs. We will use this new knowledge to write a formal guide on whatrespiratory monitoring and testing should be done after COVID-19 infection. This willensure that people affected by COVID-19 get the care they need to maintain their lunghealth.