The National Institutes of Health said on Wednesday that a nonprofit group under fire from some congressional Republicans for its research collaborations in China had failed to promptly report findings from studies on how well bat coronaviruses grow in mice.

In a letter to Representative James Comer, Republican of Kentucky, the N.I.H. said that the group, EcoHealth Alliance, had five days to submit all unpublished data from work conducted under a multiyear grant it was given in 2014 for the research. The organization’s grant was canceled in 2020 under President Donald J. Trump’s administration during his feud with China over the origins of the coronavirus.

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The Food and Drug Administration seems likely to allow Americans to switch vaccines when choosing a Covid-19 booster shot. That authorization, which could come this week, is the latest development in a long-running debate over whether a mix-and-match strategy helps protect people from the coronavirus.

Here are answers to some common questions about mixing and matching booster shots.

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When an advisory panel to federal regulators endorsed boosters for Johnson & Johnson’s one-dose Covid-19 vaccine on Friday, the scientists on the committee discussed a question many people are asking: Is it a good idea to mix and match vaccines?

The question came up after the panel heard a presentation about a study showing that the mix-and-match approach gives patients who received the Johnson & Johnson vaccine a stronger antibody response.

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WASHINGTON — A key federal advisory committee voted unanimously Friday to recommend Johnson & Johnson booster shots, most likely clearing the way for all 15 million people who got the company’s one-dose coronavirus vaccine to receive a second shot.

If the Food and Drug Administration and the Centers for Disease Control and Prevention accept the recommendation, as expected, boosters could be offered by late next week. But many committee members made clear that they believed Johnson & Johnson recipients might benefit from the option of a booster of the Pfizer-BioNTech or Moderna vaccine, something a top F.D.A. official said the agency was considering.

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