The new requirement, which will be phased in over several weeks in August and September, is the most aggressive step the city has taken yet to curb a surge in cases caused by the Delta variant.
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Scientists who studied a big COVID-19 outbreak in Massachusetts concluded that vaccinated people who got so-called breakthrough infections carried about the same amount of the coronavirus as those who did not get the shots.
Federal workers will be required to attest they’ve been vaccinated against the coronavirus or else face mandatory masking, weekly testing, distancing and other new rules.
The new mask guidance follows recent decisions in Los Angeles and St. Louis to revert to indoor mask mandates amid a spike in COVID-19 cases and hospitalizations.
U.S. cases of COVID-19 last week increased by 17,000 nationwide over a 14-day period for the first time since late fall.
The justices, by a 7-2 vote, left the entire law intact Thursday in ruling that Texas, other Republican-led states and two individuals had no right to bring their lawsuit in federal court.
Government health officials on Monday approved the first new drug for Alzheimer’s disease in nearly 20 years, disregarding warnings from independent advisers.
The guidance also still calls for masks in crowded indoor settings including buses, airplanes, hospitals, prisons and homeless shelters.
U.S. health officials say fully vaccinated Americans don’t need to wear masks outdoors unless they are in a big crowd of strangers.
U.S. health officials have lifted an 11-day pause on Johnson Johnson vaccinations following a recommendation by an expert panel.