Oklahoma hit a single-day record for cases on Wednesday, with 1,075, and its governor, Kevin Stitt, announced that he had tested positive, becoming the first governor known to become infected. Mr. Stitt has attended many public events and has often been photographed in public while not wearing a mask, including at an indoor rally for President Trump that was held in Tulsa on June 20. He said he did not know where, when or how he had become infected, and that his own infection had not prompted him to second-guess his response to the virus.

More than 65,000 U.S. cases were announced Tuesday, the nation’s second-highest daily total, and the seven-day average of new cases rose to 61,896, a new high. Many states are warily eyeing the recent explosion of cases across the Sun Belt, where some hard-hit cities were putting refrigerator trucks on standby as they anticipate running out of morgue space.

“We don’t want to become Florida, we don’t want to become Texas, we don’t want to become Arizona,” Mr. Wolf, of Pennsylvania, said, also criticizing states in the South and the Southwest for not acting sooner to curb the spread of the virus.

On Wednesday Florida became the third state — after New York and California — to surpass 300,000 cases. It governor, Ron DeSantis, a Republican, said the state would deploy 1,000 medical workers to hospitals that have beds for coronavirus patients but not enough doctors and nurses to treat them. “It really is the personnel that is going to be the key,” he said.

In Kentucky, where cases are rising and masks are now required, the governor said that people’s actions in the coming days would determine whether “we go the route of Arizona,” which has reported the country’s highest per capita growth in cases over the last two weeks.


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