Gyms are high-risk venues for COVID-19 transmission and people need to be wearing masks while there, researchers warned in two papers published on Wednesday in the US Centers for Disease Control and Prevention’s Morbidity and Mortality Weekly Report.
One study described an August outbreak in a Chicago gym where 55 COVID-19 cases were identified among 81 attendees of indoor high-intensity exercise classes.
“Twenty-two (40%) persons with COVID-19 attended on or after the day symptoms began. Most attendees (76%) wore masks infrequently, including persons with (84%) and without COVID-19 (60%),” the authors reported.
The other study reported on three gyms in Hawaii where 21 COVID-19 cases in July were linked to two instructors who taught classes while infected. The rate of infection among students exposed before the instructors showed symptoms was 95%, the authors said.
Gym attendees should wear masks, including during high-intensity activities, even when they are 6 feet (1.83 m) or more apart, the Chicago researchers said.
Facilities should enforce physical distancing, improve ventilation, and encourage attendees to isolate after symptom onset, possible exposure to COVID-19, or a positive coronavirus test result.
“Exercising outdoors or virtually could further reduce SARS-CoV-2 transmission risk,” they said
