NEW YORK — U.S. health officials are expected to release new data about the spread of covid-19 on Friday that led to their decision to recommend that vaccinated people wear masks in some situations, a reversal of previous guidance.
The report, to be released by the Centers for Disease Control and Prevention, comes from a recent investigation of a coronavirus outbreak in Provincetown, Mass., according to a federal official who spoke on condition of anonymity because they were not authorized to disclose the plan.
Earlier this week, the CDC changed its masking guidelines, recommending that even vaccinated people return to wearing masks indoors in parts of the U.S. where the delta variant of the coronavirus is fueling surges in new cases.
Citing new — but unreleased — information about the variant’s ability to spread among vaccinated people, the CDC also recommended indoor masks for all teachers, staff, students and visitors at schools nationwide, regardless of vaccination status.
