Pennsylvania Governor Tom Wolf on Aug. 31 issued a mask mandate for all K-12 school and child care facilities to protect against the spread of Covid-19, three weeks after the Democrat said he would leave the decision to individual districts.

The United States reported a 3 percent decline in new cases of Covid-19 for the week ended Feb. 28, a much smaller drop than in the previous six weeks, and health officials warned that progress against the global pandemic was stalling.

A potent coronavirus variant originating in South Africa and found to be partly resistant to current vaccines and antibody treatments was detected for the first time in the United States in two South Carolina patients, health officials said.

Walmart Inc. is preparing to offer Covid-19 vaccinations in seven more states, as well as in Chicago and Puerto Rico, expanding beyond the two states where the company’s pharmacists are offering inoculations.

The U.S. coronavirus death toll topped 400,000 on Jan. 19, according to a Reuters tally, as the country hardest hit by the pandemic struggled to meet the demand for vaccines to stem the spread of infection.

Seven U.S. states reported record one-day increases in Covid-19 cases so far in September even as the average daily number of new infections is falling nationally.

The number of new cases of the novel coronavirus reported in the United States fell 15 percent last week from the previous seven days, and deaths fell for a fourth week in a row, according to a Reuters analysis.

The number of new cases of the novel coronavirus reported in the United States fell 17 percent, the fifth straight week of declines, according to a Reuters tally of state and county reports.

The United States shattered the country’s daily record for coronavirus infections on Thursday, reporting more than 77,000 new cases as the number of deaths in a 24-hour period rose by nearly 1,000, according to a Reuters tally.

Record-breaking coronavirus cases and deaths in several U.S. states are dimming hopes of economic recovery, with cellphone data showing shoppers are staying away from stores in areas where cases are rising the most.