| U.S. President Joe Biden's plan to begin distributing boosters for most American adults by Sept. 20 is facing resistance, as members of a key panel that advises the government on vaccines said this week they were concerned that politics was getting ahead of the process. With less than three weeks until the proposed booster rollout, U.S. public health advisers and regulators are still yet to sign off on the plans. Meanwhile, many doctors and nurses are already administering the additional shots. It's "very frightening to me that health-care providers are trying to do the best job that they can, and are taking guidance from HHS and the White House," Helen Talbot, a Vanderbilt University professor of medicine, said Monday in a meeting of CDC's Advisory Committee on Immunization Practices.  President Joe Biden Photographer: Susan Walsh/AP The need for boosters is still being debated. Advocates see them as a potential tool for controlling the coronavirus surge spurred by the delta strain. Short-term data from Israel suggesting the efficacy of initial vaccinations wanes in a matter of months has been cited by the White House in making the case to act fast. In the European Union, health authorities said there's no urgent need for boosters, though some countries have decided to offer them. The World Health Organization, concerned about vaccine supplies, has pleaded for a moratorium. Vaccine maker Moderna said Wednesday that it had filed initial data with the FDA for clearance of a booster of its Covid-19 shot, adding fuel to the debate. Pfizer Inc. and BioNTech SE filed initial booster data with the agency last month. For some, the rollout has already started. Almost a million Americans have received an additional vaccine dose since Aug. 13, according to CDC data. It's unclear how many of those doses went to those with weak immune systems, for whom extra shots have been recommended by the FDA and CDC. White House medical adviser Anthony Fauci said three doses might become the standard regimen for mRNA Covid vaccines. However, the CDC's vaccine panel is still waiting for more data to determine the best booster dose approach, said Camille Kotton, a CDC vaccine adviser. For now, the majority of vaccinated Americans are well protected against severe disease, despite the delta variant's potency. During a White House briefing Tuesday briefing, CDC director Rochelle Walensky acknowledged that while data reviewed by the the agency's advisers was currently insufficient, she was confident that there would be enough to support a recommendation prior to the start of the booster plan.—Fiona Rutherford | 
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