Recovery No really, do not go back to high intensity exercises immediately! You're infectious for at least 8 days after initial symptoms. Observe 100% masking for 2wks. Yes, this may mean eating alone or where there is good airflow. COVID has weakened your immune system for at least 3 months, reduce exposure to all possible infections for this long. COVID provides NO increased immune response to COVID. You can be reinfected immediately, act accordingly.