A federal judge's decision to strike down the Centers for Disease Control and Prevention's mask mandate for travelers is only the latest in a series of challenges that seek to rein in the agency.
Doctors and health researchers are looking to testing rates, case rates – and intuition – to determine when they'll feel comfortable mingling maskless indoors.
Reversing a decision made in May that allowed fully vaccinated people to ditch the mask, the Department of Defense will follow the CDC's most recent mask guidance.