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Anthony S. Fauci, the nation’s leading infectious-disease expert, joined first lady Jill Biden at the first of two vaccination events in Florida on Thursday, the latest in the administration’s efforts to get more shots in arms.

The first lady visited a drive-through vaccination site in Kissimmee and will later attend a vaccination event at an ice hockey arena with the Tampa Bay Lightning.

“I’m here to ask anyone who’s listening," the first lady said during the first stop, “please go and get your shot.” She added: “I’m a teacher, and everything I do is evidence-based. … I asked some of the experts, and I was surprised to learn that while these vaccines might be new, the research behind them is not.”

The continued vaccination push comes as the United States crawls toward Biden’s goal of getting 70 percent of adults at least partially vaccinated by July 4. The White House conceded this week that it would narrowly miss that original target, instead announcing a new hope of ensuring that 70 percent of people 27 and older receive at least one shot through the July Fourth holiday weekend.

Here are some significant developments:

  • Federal health officials said Wednesday that there is a “likely association” between two coronavirus vaccines and increased risk of a rare heart condition in adolescents and young adults, the strongest assertion so far about the link between the two.
  • An American scientist has incited a new skirmish over the origin of the coronavirus, reporting that he has retrieved potentially significant genetic data about SARS-CoV-2 that was deleted from a digital archive at the National Institutes of Health.
  • Two million people may have suffered “long covid” in England, according to a survey backed by the British government.
  • Almost 900 Secret Service members have tested positive for the coronavirus since March 2020, according to a watchdog report, and many of those infected had protection assignments that included the safety of the president.
  • The United States on Wednesday reported a seven-day rolling average of 11,280 new infections. The number of reported tests fell by 27 percent.