COVID-19(24) SARS-CoV-2(13) Symptom(11) Infection(11) prevention(9) Result(9) public health(9) patients(9) illness(9) Football(8) protocol(8) develop(7) diagnosed(7) physical activity(7) SARS-COV-2 infection(7) exercise(6) healthy(6) moderate(6) sports and exercise medicine(6) evaluated(6) elite performance(6) Frequency(6) COVID-19 pandemic(6) Transmission(6) Asymptomatic(5) remained(5) Diagnosis(5) Antibody test(5) groups(5) soccer.(5)