COVID-19(5) exercise(4) SARS-CoV-2(4) disease(4) no difference(3) Sex(3) age(3) moderate(3) group(3) Symptom(3) physical activity(3) positive(3) BMI(3) shown(2) median(2) COVID-19 disease(2) Fever(2) Determination(2) activity(2) subject(2) athlete(2) Antibody Response(2) required(2) observational study(2) correlated(2) symptomatic(2) Mild(2) number of symptom(2) COI(2) routine(2)