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ATLANTA (AP) 鈥� U.S. Health Secretary Robert F. Kennedy’s new vaccine advisory committee returned to work Thursday, and the panel may vote on proposals about fall flu vaccines and a preservative in some flu shots that antivaccine groups have falsely tied to autism.

The Advisory Committee on Immunization Practices, meeting in Atlanta, also is expected to vote on whether to recommend a second version of a lab-made antibody that protects newborns against a childhood menace called respiratory syncytial virus, or RSV.

The ACIP, created more than 60 years ago, helps the Centers for Disease Control and Prevention determine who should be vaccinated against a long list of diseases, and when. Those recommendations have a big impact on whether insurance covers vaccinations and where they鈥檙e available.

Kennedy was a leading voice in the antivaccine movement before becoming the nation鈥檚 top health official. He fired the previous 17-member panel this month and replaced it with a seven-member group that includes several vaccine skeptics.

At its June meetings, the committee usually refreshes guidance for Americans 6 months and older to get a flu shot, and helps propel the annual fall vaccination campaign.

Presentations prepared for Thursday’s meeting suggest that the panel may do much the same this year. But there’s also a flu-related vote that promises controversy.

It concerns thimerosal, a form of mercury that鈥檚 been added to vaccines since the early 20th century to preventing bacterial contamination in multi-dose vials.

Kennedy has long held there was a tie between thimerosal and autism, and also accused the government of hiding the danger. Study after study has found no evidence that thimerosal causes autism. But since 2001, vaccines manufactured for the U.S. market and routinely recommended for children 6 years or younger have contained no thimerosal or only trace amounts, with limited exceptions.

Thimerosal was placed on the meeting agenda shortly after Kennedy鈥檚 new vaccine advisory was named last week.

Before the vote, the committee will hear from Lyn Redwood, the former president of what is now known as Children鈥檚 Health Defense 鈥� an antivaccine group founded by Kennedy.

Some public health experts contend the thimerosal discussion will unnecessarily raise doubt in vaccines while possibly also making them more expensive and harder to get this fall.

At the panel’s meeting Wednesday, Chrissie Juliano, executive director of the Big Cities Health Coalition, lamented the ouster of the former ACIP panel and the agenda of the new one.

Her organization, which represents large city health departments, 鈥渋s deeply concerned that many routine vaccines may soon become inaccessible or unaffordable for millions of Americans if ACIP makes changes based on ideology rather than science,” she said. “The stakes are simply too high to let that happen.鈥�

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Neergaard reported from Washington.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute鈥檚 Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.