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It's not clear exactly what the committee is considering, but the American Academy of Pediatrics will still urge a birth dose, said the organization's Dr. Sean O'Leary.

“We are going to continue to recommend it because it saves lives,” he said.

Here's a look at the disease, the vaccine and the debate over changing the recommendations.

Liver disease can cause lifelong health issues

Hepatitis B is a serious liver infection that for most people lasts less than six months. But for some — especially infants and children — it can become a long-lasting problem that can lead to liver failure, liver cancer and scarring called cirrhosis.

In adults, the virus is spread through sex or through sharing needles during injection-drug use.

But it can also be passed from an infected mother to a baby. As many as 90% of infants who contract hepatitis B go on to have chronic infections, meaning their immune systems don't completely clear the virus.

As many as 2.4 million people in the U.S. are estimated to have hepatitis B, and as many as half are unaware they are infected, according to information from the Centers for Disease Control and Prevention.

Dr. Baruch Blumberg, a federal scientist, identified the virus behind the infection in 1965. He won the Nobel Prize for the discovery, which led to tests and vaccines. The first hepatitis B vaccine was licensed in the U.S. in 1981.

Shots for newborns have been recommended for years

For decades, the nation's vaccine guidance has been influenced by a government-appointed panel of experts, the Advisory Committee on Immunization Practices. Its recommendations have usually been adopted as national guidance that is widely heeded by doctors.

In 1991, the committee recommended an initial dose of hepatitis B vaccine at birth. The guidance was modified a little over the years and currently suggests a dose within 24 hours of birth for all medically stable infants who weigh at least 4.4 pounds (2 kilograms), plus follow-up shots to be given at about 1 month and 6 months.

Why a dose right at birth? Health officials used to rely on screening expectant mothers to find babies that might have been exposed to the virus. But many cases were missed, experts say, because some women weren't tested or test results were incorrect. Also, the virus can live on surfaces for more than seven days at room temperature, so unvaccinated children living with a person with a chronic infection can catch it.

Newborn hepatitis B vaccinations are widely considered to be a public health success story. Over about 30 years, cases among children fell from about 18,000 per year to about 2,200.

A collaboration of public health researchers, the Vaccine Integrity Project, this week released its of more than 400 studies and reports spanning 40 years. The group concluded the birth dose is safe, and is an important reason U.S. pediatric hepatitis B infections have fallen.

Committee revisits the newborn recommendation

Kennedy, a leading anti-vaccine activist before becoming the nation’s top health official, of ACIP earlier this year and replaced them with a group that includes .

The panel has raised concerns about giving a vaccine to a baby so early in life.

“Are we asking our babies to solve an adult problem?” committee member Dr. Evelyn Griffin asked at a September meeting.

Peppered with questions about why a change was necessary, committee member Dr. Robert Malone said: “The signal that is prompting this is not one of safety. It’s one of trust. ... It’s one of parents uncomfortable with this medical procedure being performed at birth in a rather unilateral fashion without significant informed consent."

The committee tabled a vote at the September meeting, but it's slated to be acted on during Thursday's meeting, according to . Federal officials have not answered questions about exactly how much of a delay is being proposed, or disclosed what research is being used as a basis for such a decision.

What would happen if the shots are delayed?

Not knowing what the committee is contemplating makes it difficult to guess the potential impact. But some have tried.

This week, public health researchers collaborating with hepatitis-focused advocacy organizations released estimating that delaying the birth dose to 2 months could result in at least 1,400 hepatitis B infections in children and 480 deaths. The report — which has yet to be peer reviewed or published in a medical journal — estimated the toll would be higher if the first dose was given even later.

But an ACIP change to the recommendation may have limited impact, O'Leary said.

The committee's most direct power comes over what's covered by the government Vaccines for Children program, which pays for shots for uninsured children from low-income families. Hepatitis B shots often have been bundled into the final hospital bill for childbirth. So a new ACIP recommendation likely would not be an economic obstacle for the current practice continuing at many hospitals, he said.

But any change stands to confuse and frighten parents, he added.

“If it scares, it shares” on social media, O'Leary said.

Several medical and public health organizations — and even some state government officials — have said, in advance of the meeting, that changing the recommendation is a terrible idea. Among them is a recently formed coalition of government leaders from several Northeastern states, which this week issued a statement saying they would continue to urge families to get a birth dose within 24 hours of delivery.

U.S. Sen. Patty Murray, a Democrat from Washington, this week called on Congress to compel Kennedy to appear at a hearing and explain ACIP's actions.

“Ending the decades-long recommendation that babies born in the U.S. get vaccinated against hepatitis B is a heartless choice to allow babies to die," Murray said in a statement.

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