Consistently wearing high-quality masks offers strong protection, a study in California suggests.
ImageBy the end of last year, Stacey Ricks of Spring, Texas, had received five coronavirus vaccine shots. She is immunocompromised and faces a greater risk of death from the virus.Credit…Callaghan O’Hare for The New York Times The Centers for Disease Control and Prevention on Friday encouraged people with weakened immune systems to come forward sooner…