CDC Links Mask Advice to ‘Compelling’ Real-World Shot Study (1)

The Pfizer Inc.-BioNTech SE vaccine and the Moderna Inc. shot were 94% effective against symptomatic Covid-19 in a real-world study of health-care workers that was key to the federal decision to ease restrictions for fully vaccinated people.

“This report provided the most compelling information to date that Covid-19 vaccines were performing as expected in the real world,” Rochelle Walensky, head of the U.S. Centers for Disease Control and Prevention, said in a statement. “This study, added to the many studies that preceded it, was pivotal to CDC changing its recommendations for those who are fully vaccinated ...