Atlanta, Georgia - A CDC vaccine advisory panel on Friday panel questioned the efficacy and safety of Covid-19 vaccines and declined explicitly to recommend them as experts slammed its reliance on "myths" and "anecdotes."

The Advisory Committee on Immunization Practices (ACIP) – which Health Secretary Robert F. Kennedy Jr. packed with handpicked members – said obtaining a Covid-19 shot should be based on individual choice in consultation with a medical professional.

The panel also approved language recommending that the CDC urge health care providers to more strongly warn about alleged risks from vaccinations.

Many medical and scientific organizations have cited evidence of the Covid shot's safety and its record of providing strong protection against severe illness or death.

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Calling the committee's actions "extraordinarily vague," Sean O'Leary of the American Academy of Pediatrics said "this was like nothing I've ever seen."

"What it looked like to me was a lot of clear efforts to sow distrust in vaccines, to instill fear," he told AFP.

"The focus of a lot of the discussion that we saw today around Covid vaccines was around myths, anecdotes, case series, case reports," O'Leary said. "They were not focused at all on the actual science."

Those comments mirrored criticisms leveled by non-voting observers who attended the meeting.

"It's troubling to see the erosion of the committee's integrity," said Sandra Fryhofer of the American Medical Association.

The FDA has already narrowed approval for Covid shots – which all Americans could once get with relative ease – to the elderly and people with underlying conditions.

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That followed RFK Jr. spring announcement that the US would no longer recommend the shots for children and healthy pregnant women.

Public health experts have warned these shifts could muddle access for people seeking boosters both in terms of cost and availability, amid a resurgence in cases and hospitalizations.

The ACIP committee considered whether to require that any person seeking a Covid vaccine first obtain a prescription – but that measure narrowly failed by a tie-break vote.

"The segment of the population that is under-insured, has lack of access to health care – they're going to be unable to get a prescription. And those are the people that are at highest risk," said ACIP member and epidemiologist Catherine Stein in her dissent.

The ACIP meeting's first day ended in confusion and contradiction. The committee recommended no child under four should receive the combination MMRV shot, which covers measles, mumps, rubella and varicella.

But they also declared that a federal children's vaccine program should still pay for it. And in a chaotic twist, they reversed that decision in a second vote Friday morning.

Parents will still be offered separate MMR and chicken pox injections for their children younger than four. The combination shot has a small risk of causing temporary, non-life-threatening febrile seizures.

Members also were meant to decide whether to recommend against the longstanding practice of immunizing newborns against Hepatitis B within the first 24 hours of life.

Public health experts have met the prospect of that move with widespread alarm.

Swift vaccination has proven the best way to prevent any maternal transmission of the incurable, highly contagious disease that can cause severe liver damage and cancer later in life, said Adam Langer, a CDC scientist who presented to the voting members.

Ultimately the committee decided more debate was needed.