(CNN) — The number of people in the US looking to boost their Covid-19 vaccinations has surpassed the tally of those looking to begin them as booster doses from more drug makers may soon be available.

There are 1.3 times as many boosters administered each day compared with first shots, data from the US Centers for Disease Control and Prevention shows.

And the number could grow, as the CDC’s vaccine advisory committee prepares to meet Thursday to discuss booster doses for Moderna and Johnson & Johnson, as well as mixing and matching boosters and original doses among the drug makers.

Until this week, only the Pfizer vaccine has been authorized for use as a booster for members of certain high-risk groups who received two doses of the Pfizer/BioNTech vaccine at least six months ago.

A booster dose of the Pfizer coronavirus vaccine was found to be highly effective — 95.6% — in a Phase 3 trial, the companies announced Thursday. “Efficacy was consistent irrespective of age, sex, race, ethnicity or comorbid conditions,” they noted.

The Food and Drug Administration on Wednesday authorized booster doses of the Moderna and Johnson & Johnson vaccines and said any of the three authorized vaccines could be used as a booster in a “mix and match approach” for those eligible.

The CDC on Thursday is expected to decide which groups it recommends for boosters. Typically, shots can be administered once the CDC director signs off on the recommendation.

The FDA, pending more safety data, could also soon lower the age range on its emergency use authorizations for booster shots for coronavirus vaccines, officials told reporters Wednesday.

“We want to make sure that if we deploy the boosters in all of the age ranges that we truly are making a benefit outweigh any risk,” said Dr. Peter Marks, director of that agency’s vaccine arm, the Center for Biologics Evaluation and Research. “We will not hesitate to drop this age range as we see this benefit outweigh the risk, and because of the EUA authority that we have, we can do that in a relatively quick amount of time.”

Health experts stress vaccination as the key to controlling the spread of Covid-19, and many are still encouraging more Americans to get their first doses.

Evidence suggests that immunity from full vaccination can wane, driving the push to authorize booster doses of coronavirus vaccine, acting FDA Commissioner Dr. Janet Woodcock said Wednesday.

“To date, the currently available data suggest waning immunity in some populations of fully vaccinated people,” Woodcock told reporters during a telephone briefing.

“And the availability of these authorized boosters is important for continued protection against Covid-19 disease,” she added. “The actions we have taken … help address this waning immunity.”

Vaccinating younger kids will play a ‘major role’ in controlling the pandemic

Younger children are still not eligible for even their first doses, but their protection will be key to bringing the pandemic under control, experts have said.

Currently, only adolescents as young as 12 are eligible for vaccines, but data has been submitted to the FDA for doses for children 5 to 11.

About 28 million children 5 to 11 could soon become eligible to get vaccinated if the FDA authorizes shots for this age group and if the CDC recommends it.

Getting most children vaccinated against Covid-19 will “play a major role” in slowing the spread of disease, Dr. Anthony Fauci said Wednesday.

“In the era of Delta, children get infected as readily as adults do. And they transmit the infection as readily as adults do. We may not appreciate that, because about 50% of the infections in children are asymptomatic,” Fauci told a White House Covid-19 briefing.

“If we can get the overwhelming majority of those 28 million children vaccinated, I think that would play a major role in diminishing the spread of infection in the community,” said Fauci, who is chief medical adviser to President Joe Biden and director of the National Institute of Allergy and Infectious Diseases.

“That’s one of the reasons why we want to do as best as we can to get those children from 5 to 11 vaccinated.”

And when they do roll out, the US surgeon general wants to make vaccines available to children as soon as possible, he said.

“That preparation takes planning, it takes time, and that’s why we’ve been working very hard to do a few things over the last several weeks to months,” Dr. Vivek Murthy told NBC.

Attendance rates for homeless students have plummeted in the pandemic

Although children have not had the highest rates of infection, they have faced many of the pandemic’s impacts. And for children without homes, there have been even more barriers.

Attendance rates of homeless students in New York City public schools have dropped significantly amid the pandemic, according to a study released this week by the Advocates for Children of New York.

The study, which used attendance data from the New York City Department of Education, documented that the average attendance rate of students in shelter during the first couple of weeks of the winter semester was only 73%. The year-to-date attendance rate for students in shelters is 78.5%, according to the agency.

There are especially high rates of absenteeism at the high school level, according to the study. Tenth graders “missed more than one out of every three school days in winter and spring 2021, while 9th, 11th, and 12th graders in shelter were absent more than 25% of the time,” according to the advocacy group.

Even prior to the pandemic, the average attendance rate for New York City students living in shelters during the 2019-20 school year was only 83.2%, compared to 92.2% for permanently housed students, the study shows. Covid-19 only added new barriers.

“High rates of absenteeism in winter and spring 2021 point to a particular need for support for students living in shelter as schools reopen this year,” the study says.

The nonprofit recommended that the city Department of Education should use federal Covid-19 relief funds to hire 150 shelter-based agency community coordinators as a start to “overhaul the education support system in shelters.” Community coordinators are typically responsible for providing support and resources to help students get to school.

“If we want to break the cycle of family homelessness, the city must address barriers to attendance for students in shelter,” Jennifer Pringle, director of the Advocates for Children’s Learners in Temporary Housing project said. “Fortunately, the DOE is in a position to tackle barriers to attendance for students in shelters with the tens of millions of dollars in federal American Rescue Plan Act — Homeless funds it is poised to receive.”

The city Department of Education is in the process of planning for the use of federal money to expand staffing, it said. There are currently 324 agency personnel in direct contact with homeless students and their families daily, it said.

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