Health

(NEW YORK) — Gretchen Lee, a third grader in Washington, D.C., was wrapping up her last week in school ahead of Christmas break when the unexpected happen.

A fully vaccinated 8-year-old, Gretchen tested positive at school for the virus that causes COVID-19 — likely the omicron variant that has whipped around the globe with lightning speed.

Within a matter of hours, a long-planned family trip to Seattle to visit a new baby cousin suddenly evaporated. Her parents’ tickets to the new Spider-Man movie went unused. And Gretchen, whose symptoms are mild, is now mostly isolating until her parents can figure out next steps.

“I didn’t think that they would have to separate me from my sister,” Gretchen said when asked about the worst part of getting COVID just days before Christmas.

It’s the Grinch’s dirtiest trick yet. If 2020 was the year we all stayed home, 2021 was supposed to be the year of joyous family reunions and travel splurges.

Instead, the nation has logged more than 1.1 million new coronavirus cases in the last week alone. And many of the cases are children, with 170,000 kids testing positive last week.

The Centers for Disease Control and Prevention says any person infected with the virus — vaccinated or not — should isolate for 10 days. That means staying alone in a bedroom and, if possible, not sharing a bathroom.

It’s a rule that’s never been practical for families living in small spaces or with very young children.

It’s also one that, during Christmas, seems a particularly cruel twist of fate for conscientious parents and their Santa-loving kids.

“We have done everything that we were supposed to do,” said Gretchen’s mom, Gloria Lee, who, like her husband, is both vaccinated and boosted.

Dr. Mark Kline, an American pediatrician and infectious diseases specialist working as physician-in-chief and chief medical officer at Children’s Hospital New Orleans, said there’s no one good answer for how to handle a COVID case in the family.

In lieu of strict isolation, a family could opt for masks in the house, assuming everyone else is fully vaccinated and low medical risk, he said. Upgrading to surgical masks instead of cloth masks is a good idea too. And moving the celebration outdoors or cracking the windows can make it less likely the virus will spread, Kline said.

“These are difficult questions to answer. There’s the ideal, and then there is the pragmatic approach. And I think we have to be pragmatists on this,” said Kline.

Some doctors and disease experts are questioning whether the 10-day isolation rule still makes sense if people are vaccinated. That’s because while a vaccinated person without symptoms can still spread the virus, they probably aren’t contagious for as long as an unvaccinated person.

Dr. Amesh Adalja, a senior scholar at Johns Hopkins’ Center for Health Security, estimates a vaccinated person’s infectious period is about 40% or 50% shorter than the unvaccinated. So, instead of 10 days isolation, they might only need five or six, he said.

“When people get a breakthrough infection, the period of time that they are contagious is truncated, because the immune system jumps into effect very quickly and slams down the viral load,” Adalja said.

One tactic for families, Adalja said, could be to keep doing a rapid test on the COVID-positive person until they test negative. Whereas a laboratory PCR test might still pick up tiny pieces of the virus, the benefit of a rapid test is that it is most likely to register positive while a person is truly contagious.

The approach isn’t foolproof, and families might need to think twice if anyone has a medical condition that makes them vulnerable to a more serious outcome from COVID. But a truncated isolation period for a vaccinated person is already being pushed by the airlines and some health care workers who say it doesn’t make sense to keep vaccinated personnel at home for the full 10 days.

Late Thursday, the CDC relaxed its quarantine and isolation rules slightly for health care workers out of concern that hospitals might face severe staffing shortages next month following the latest wave of omicron cases.

“We have the technology to (avoid) one-size-fits-all isolation periods for everybody. We can use antigen testing to be able to do this,” Adalja said. “If the NFL can do it, why can’t we?”

As for Gretchen, who is asking in vain for a puppy this Christmas, she isn’t too worried about getting sick because she understands the vaccine will protect her.

But her parents say they wouldn’t mind more up-to-date guidance from federal health officials on whether a 10-day isolation period makes sense for a vaccinated person and how to navigate testing other vaccinated members of the household.

“There are obvious downsides to not making memories and missing out playing and being social. Those are real harms,” said Gretchen’s father, Woo Lee.

“But you know, the other side of that is that she could continue to spread this virus,” he said, adding, “Our decisions could affect other people.”

ABC News’ producer Arielle Mitropoulos and Karen Travers contributed to this report.

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(NEW YORK) — The World Health Organization is investigating a mysterious illness in South Sudan that has killed dozens of people.

So far, 97 people have died of the unknown disease in Fangak, Jonglei State, in the northern part of the country.

Fangak County Commissioner Biel Boutros Biel told ABC News on Thursday that the latest fatality occurred in an elderly woman.

Deaths have mostly been reported among the elderly and children ages 1 to 14, according to a statement from South Sudan’s Ministry of Health.

The symptoms of the mysterious illness include cough, diarrhea, fever, headache, chest pain, joint pain, loss of appetite and body weakness, officials said.

Biel said the WHO team that traveled to Fangak has since left, but did not communicate their findings to local officials.

In a statement to ABC News, Collins Boakye-Agyemang, a spokesperson for WHO Africa, said the agency began investigating the outbreak in November but did not provide further details.

According to BBC News, because the area has recently been hit with heavy floods, the WHO tested samples from patients for cholera, which is typically contracted from infected water supplies.

However, the samples returned negative for the infectious bacterial disease, the outlet reported.

Sheila Baya, a lecturer in the College of Medicine at University of Juba in South Sudan, told BBC News that WHO scientists had to reach Fangak by helicopter due to the flooding to conduct testing.

Biel told ABC News that some nongovernmental organizations have delivered medical supplies to Fangak and are in the process of setting up mobile clinics to help treat people.

In a statement last month, international humanitarian group Médecins Sans Frontières (Doctors Without Borders) called the floods a “perfect storm” for disease outbreaks.

“People do not have enough water or options for water storage, and there is no garbage collection, while dead goats and dogs are left rotting in the drainage systems,” the statement read. “With the conditions further worsened by the influx of new arrivals [at camps], people are at higher risk of outbreaks and waterborne diseases such as acute watery diarrhea, cholera and malaria.”

ABC News’ Morgan Winsor contributed to this report.

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The Food and Drug Administration on Thursday authorized Merck’s COVID-19 pill for certain adults.

The authorization is limited to adults who have a high risk of severe illness and for whom alternative FDA-authorized treatment options are not accessible or medically appropriate.

This is the second COVID-19 treatment in pill form after Pfizer’s pills were authorized Wednesday.

This is a developing story. Please check back for updates.

ABC News’ Sony Salzman contributed to this report.

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With omicron’s explosive spread threatening to outpace current COVID-19 treatments, the race is on to find new options that will stand up to the variant.

The first oral antiviral treatment for the virus was authorized by the Food and Drug Administration Wednesday. Pfizer’s Paxlovid has proved effective against severe illness and death from COVID, and is expected to hold up against omicron. The news lent a glimmer of hope amid the latest surge, but supply is expected to remain limited for months as production ramps up.

Meanwhile, omicron’s high transmission rate is squeezing what was already a finite arsenal of COVID treatments. Of the currently authorized monoclonal antibody therapies — which have become a primary treatment for COVID to help keep patients out of the hospital — two of the main ones bought in bulk by the U.S. government have not been successful against the omicron variant.

The third option, one so far expected to remain effective against omicron, is in scant supply with federal health officials moving quickly to stockpile the drug, called sotrovimab, from Vir Biotechnology and GlaxoSmithKline.

Dr. Anthony Fauci, the nation’s top infectious disease expert, said the low supply of sotrovimab is “something we need to worry about” in a private call this week between the White House COVID response team and the nation’s governors obtained by ABC News.

The Biden administration is aiming to double its sotrovimab supply to more than 1 million treatment courses, making 300,000 doses available in January.

So far about 55,000 doses of sotrovimab have been allocated to states, with federal health officials promising shipments would arrive as soon as this week. But as the omicron variant rapidly advances — nearly three-quarters of all COVID cases are now omicron — health officials are bracing for a winter surge while potentially lacking ample defense from treatments that hold up against the new variant.

Marcus Plescia, chief medical officer of the Association of State and Territorial Health Officials, told ABC News that state leaders gearing up for omicron face a multi-pronged challenge: what was a “compelling tool” against the virus is now compromised, and what now works is still in limited supply. In addition, with hospital staffing shortages, there are looming concerns that manpower to administer the treatment will also be scarce.

“We can’t just hope it’s delta and give the older therapies,” he said. “Even if all of these monoclonal treatments still worked against all the variants, and we had an abundant supply, I’d worry we would get to a place where we just didn’t have the capacity to administer them.”

Evusheld, the pre-exposure monoclonal treatment from AstraZeneca, authorized earlier this month and expected to hold up against omicron is another treatment that could help out health officials. It can be given to a small subset of people for preventative use against the virus, such as those where the vaccines are not effective because of compromised immune systems.

“We’re in a very tight situation now where the virus is increasing faster than our access to the drugs that can treat it,” said Dr. Andrew Pavia, a fellow with the Infectious Diseases Society of America and a treatment guidelines panel member with the National Institutes of Health, told ABC News. “Once we have an adequate supply of sotrovimab, of Evusheld and of Paxlovid, we’ll have some pretty good tools for fighting omicron. But the virus is going to wash over the country before we have an adequate supply. So I’m worried January is going to be ugly.”

A spokeswoman for GSK told ABC News the company is “working with urgency and exploring options to expand our supply capacity in 2022,” including securing additional batches of the ingredients they’ll need to amp up sotrovimab manufacturing, and pushing up their next year supply plans to make more available sooner.

“The challenge is that the supplies [of sotrovimab] are still very limited,” Pavia said. “It’s going to require some very careful prioritization of who needs the drug the most.”

It’s not the first time new variants have hindered mainstay COVID treatments: for several months earlier this year federal health officials paused distribution of Eli Lilly’s monoclonal antibody treatment when it was shown to be ineffective against the gamma and beta variants. The Food and Drug Administration recommended health care providers use alternative authorized antibodies — like Regeneron and GSK — which had shown to hold up against the main variants of concern.

The government spent billions of dollars purchasing Regeneron and Eli Lilly’s monoclonal antibody cocktail to ensure there would be enough supply; GSK’s had not been as widely purchased and distributed. When delta became the dominant variant of concern and all three antibody therapies were effective against it, Eli Lilly’s authorization was renewed.

Health officials have increasingly turned to these therapies as breakthrough cases have ticked up and vaccination rates have not ticked up enough. These antibodies are synthetic versions of the body’s natural line of defense, meant for COVID patients early on in their infections and who are at high risk of getting even sicker in order to help keep them out of the hospital.

The currently authorized COVID-19 vaccines and their booster doses have still shown to be highly effective at preventing severe illness and death.

But as omicron gains steam, some hospitals, like Mount Sinai in New York, have already put a pause on using Regeneron and Eli Lilly’s treatments, given they are not effective against the variant. Some jurisdictions, however, are still clamoring for more supply amid the new crush of cases.

Miami-Dade County exhausted its supply of Regeneron’s treatment this week, shutting down its infusion site for a day while more was secured, a spokesperson for the mayor’s office told ABC News. They now have enough to last until Monday.

“What’s emerging is a realization that this virus is going to be with us for a while, and it’s going to be challenging,” Plescia said. “We’re just going to have to get through this as best we can and find new tools to meet that challenge.”

ABC News’ Eric M. Strauss and Cheyenne Haslett contributed to this report.

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(NEW YORK) — Urgent care chain CityMD announced it is temporarily closing more than a dozen of its 150 locations in New York and New Jersey amid a surge in COVID-19 cases and increased demands for testing.

The 19 shuttered clinics include 13 in New York City — impacting every borough except Staten Island — two on Long Island, one in Westchester County, and three in New Jersey.

“To preserve our ability to staff our sites, we are temporarily closing certain locations effective December 22,” a statement on CityMD’s website read. “It is our hope that closing sites now will best allow us to avoid future closures as this surge continues.”

It is not clear when the locations will reopen, with CityMD directing patients to visit nearby locations for testing in the meantime.

This is not the first time that CityMD has closed locations due to the pandemic.

During Thanksgiving last year, the urgent care chain announced all locations would close 90 minutes earlier, citing staff working longer hours than scheduled due to long COVID-19 testing lines

CityMD did not immediately respond to ABC News’ request for comment.

The closures come as states in the Northeast continue to report record-breaking numbers of COVID-19 cases.

On Wednesday, New York reported record-high infections for the fifth time over six days, with more than 28,000 people testing positive, state data showed.

Additionally, New York City has the country’s highest new case rate, with 1,019 cases per 100,000 people over the last seven days, according to data from the Centers for Disease Control and Prevention.

To meet the demand for testing, Mayor Bill de Blasio announced the city would be opening more than 20 testing locations this week.

Gov. Kathy Hochul also said the state intends to set up an online portal through which New Yorkers can order at-home rapid tests. The tests will mostly be sent to areas where vaccination rates are lagging and cases are rising.

New Jersey also reported a record number of COVID-19 cases on Wednesday, with 9,711 confirmed infections.

The state already has a program in place for residents to request a free COVID-19 test kit in the mail. The sample is then sent back to a laboratory with results available within 48 hours.

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(WASHINGTON) — D.C. Mayor Muriel Bowser announced Wednesday that certain establishments, including restaurants, bars, nightclubs, gyms, events and meeting spaces, will require proof of COVID-19 vaccination beginning in January.

Patrons above the age of 12 will be required to be partially vaccinated by Jan. 15 and fully vaccinated by Feb. 15.

“If you are a resident that is not yet vaccinated and you want to continue enjoying these activities, now is the time to get vaccinated,” Bowser said.

Citing new data from the Centers for Disease Control and Prevention reporting omicron as now the dominant strain in the U.S., D.C. Department of Health official Patrick Ashley said it was only “a matter of time” before that played out in the district, which currently has 25 confirmed cases of the new variant.

Ashley also pointed to huge spikes in the weekly and daily case rate in D.C. from a month ago, attributing them, in part, to the winter surge and the omicron variant.

A month ago, D.C. reported a daily case rate of 13.7 cases per 100,000 people. As of Wednesday, the rate had jumped nine times to 123.8 cases per 100,000 people.

Bowser noted that some exceptions to the new mandate will be made for patrons not staying long at a restaurant, for example, a patron picking up an order.

The move follows in the footsteps of other major U.S. cities like New York City, San Francisco and Los Angeles that have similar vaccine requirements.

Approved proof of vaccination includes vaccination cards or photos of vaccination cards, immunization records or verification apps like CLEAR and VaxYes.

Further guidelines on the requirements are still to come, Bowser said. Wednesday’s initial announcement of the new guidelines was made to give businesses enough time to prepare.

Bowser also announced that to meet the increased testing demand among residents, the district will order another five million rapid antigen tests, for a total of six million.

Students in D.C. schools will also have to be immunized beginning March 1, following regulations from the D.C. Council.

Bowser also encouraged residents to celebrate safe holidays and asked people to have small gatherings, wear masks and gather outdoors.

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(NEW YORK) — A month after the omicron variant was first identified, it has become the dominant strain in the United States, responsible for about three-quarters of new COVID infections.

As of Wednesday, cases have been identified in 49 states and Washington, D.C. South Dakota has not reported any omicron infections yet.

While there is still much to learn about omicron, more research is being done every day furthering health officials’ understanding of this highly transmissible variant.

Spreads more easily than any other variant

A growing body of evidence suggests the omicron variant may spread more easily than any other variant identified during the pandemic.

Health officials, such as Centers for Disease Control and Prevention Director Dr. Rochelle Walensky, say early data shows omicron doubles in prevalence every two to three days.

This is much faster than the delta variant which, at its peak, had a doubling time of about seven days.

“This is an incredibly fast-moving variant,” Dr. John Brownstein, an epidemiologist at Boston Children’s Hospital and an ABC News contributor, said. “We only identified it on Thanksgiving and it’s already the dominant variant in the U.S. The level of certainty we have in the U.S. that it is more transmissible than any variant before is high.”

Omicron partially impacts vaccines, but a booster helps

Omicron seems to evade — at least partially — protection offered by COVID-19 vaccines more easily than previous variants, but it’s unclear by how much. However, studies have been showing boosters help restore much of that lost protection

Preliminary data from Pfizer-BioNTech showed that people who received two doses of their vaccine had low levels of neutralizing antibodies against the variant.

Those who received their booster shot, however, saw their levels of antibodies increase 25-fold compared to pre-boost levels.

Additionally, early data from Moderna released on Monday showed its 50-microgram booster increases antibody levels 37-fold.

Two-dose vaccines still dramatically reduce the risk of severe illness and death, health officials say.

​​”It’s still an open question about what relative protection you get,” Brownstein said. “It appears vaccines still provide incredible protection around severe illness and death, especially if boosted.”

Additionally, it does not appear that previous COVID infection protects against reinfection from omicron the same way that it did against the delta variant.

A recent study from Imperial College London, which has not yet been peer-reviewed, suggests that the risk of infection with omicron is five times higher than with delta.

Monoclonal antibodies are less effective, but not pills

Treatments also appear to have been affected by the emergence of omicron.​​According to a readout of this week’s private call between U.S. governors and the White House, which was obtained by ABC News, two of three monoclonal antibody therapies used to treat COVID are less effective against the new variant.

The antibody treatments made by Regeneron and Eli Lilly are not as effective while the third option, made by Vir Biotechnology and GlaxoSmithKline, may be effective but in short supply.

Dr. Anthony Fauci stated that pills produced by Merck and Pfizer do not appear to be impacted by omicron, according to the readout.

Too early to tell if omicron causes severe illness

Health officials still do not know if omicron causes mild or severe illness.

Studies that have been published have offered conflicting findings. A study from South Africa found that the risk of hospitalization for adults was 30% lower compared to the delta-fueled surge during the fall.

But the study from ICL found that omicron did not show any signs of being milder than delta.

In a recent statement, the World Health Organization said it’s too early to say whether omicron causes more mild or severe illness.

So far, only one death from the omicron variant has been identified: An unvaccinated Texas man in his 50s who had previously been infected with the virus. It’s important to remember that not every COVID-related death is reported to health authorities.

Until we learn more about omicron, Brownstein said the best way to protect ourselves is to follow mitigation measures that are known to work, including vaccination and mask-wearing.

“The No. 1 thing that people can do is make sure they’re vaccinated and boosted. That is still our absolute No. 1 line of defense,” he said. “Use rapid tests as a way to identify if you may be contagious and wear a high-quality mask in indoor settings, especially if you’re around people with unknown vaccination status.”

ABC News’ Sasha Pezenik contributed to this report.

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(NEW YORK) — An at-home treatment for COVID-19 that can prevent serious illness was authorized by the Food and Drug Administration on Wednesday, offering a note of optimism for the future of the pandemic as the world faces the omicron variant.

When taken early, Pfizer’s pill was 89% effective at reducing the risk of severe illness and death from COVID-19, according to the company, and was effective against omicron.

Pfizer CEO Albert Bourla estimated that 1,200 deaths and 6,000 hospitalizations would be prevented for every 100,000 COVID-19 patients who take the pills.

The FDA said the pill, Paxlovid, was authorized for the treatment of mild-to-moderate coronavirus disease in anyone 12 years and older who weighs at least about 88 pounds. Patients must test positive and be at high risk for progression to severe COVID-19, including hospitalization or death.

Paxlovid will be available by prescription only and should be started as soon as possible, ideally within five days of symptom onset, the FDA said.

“This authorization provides a new tool to combat COVID-19 at a crucial time in the pandemic as new variants emerge and promises to make antiviral treatment more accessible to patients who are at high risk for progression to severe COVID-19,” Dr. Patrizia Cavazzoni, director of the FDA’s Center for Drug Evaluation and Research, said in a press release.

The treatment course requires taking several pills, twice per day, for five days.

The government has ordered 10 million pills of Pfizer’s Paxlovid and another treatment pill, Merck’s Molnupiravir, which has yet to be authorized.

The order will come in as it’s produced, with some doses available upon FDA authorization, White House COVID coordinator Jeff Zients told governors on a call Tuesday.

The federal government has already contracted with Pfizer to purchase the pills at $530 a course, or $5.3 billion.

There is not expected to be any direct cost to patients.

The pills offer hope, particularly as the omicron variant spreads rapidly across the U.S.

Vaccination and booster shots are the best defense against omicron, offering up to 80% protection by some estimates, and unvaccinated Americans will be hit hardest by the surge. But there will also be more breakthrough infections among vaccinated people because of omicron’s mutations.

“While not a replacement for vaccines, the emergence of new variants has highlighted the need for new therapeutic lines of defense,” said Dr. John Brownstein, an epidemiologist at Boston Children’s Hospital and ABC News contributor.

“The combination of low friction access and high efficacy means that we finally have a therapy that can make a real impact on the trajectory of this pandemic,” he said.

Public health experts and the pharmaceutical companies who make the pills also have been firm that the treatments alleviate illness — they do not prevent it. Vaccines do, and they’re still the safest, most effective option to stay out of the hospital.

“I want to emphasize that no one should use the existence of the pill as an excuse to avoid vaccination,” Bourla, Pfizer’s CEO, said.

The U.S. will also likely face some hurdles in the initial rollout — another reason they shouldn’t be relied upon as an alternative to vaccination.

One concern is that the pills need to be taken early, which means patients will need a positive test and a doctor’s appointment very soon after they get sick. Testing delays and overburdened hospital systems could make that more challenging.

They are most effective “before a person becomes critically ill,” said Dr. Paul Currier, director of the Respiratory Acute Care Unit at Massachusetts General Hospital. “Once a patient becomes critically ill, the virus has already caused a lot of inflammation in the body that likely cannot be stopped by medicines that only target the virus itself.”

But pharmaceutical executives are optimistic that the pills will make a significant dent in the pandemic.

Pfizer’s pill has the “potential to save the lives of patients around the world,” Bourla said.

ABC News’ Dr. Navjot Kaur Sobti contributed to this report.

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(ATLANTA) — Life expectancy in the United States decreased by nearly two years in 2020, mainly because of the pandemic, a new federal report suggests.

In 2019, Americans had a life expectancy — the average number of years a person is expected to live — of 78.8 years.

But new data from the Centers for Disease Control and Prevention’s National Center for Health Statistics (NCHS) found this figure fell to 77.0 years in 2020, marking the biggest drop seen since World War II.

“The thing that stands out to me is just this staggering decline,” Dr. Robert Anderson, chief of mortality statistics at the NCHS, told ABC News.”I know 1.8 years doesn’t seem like a whole lot but, on a population scale, that’s a huge decline in life expectancy.”

This is the biggest decrease seen since World War II, when life expectancy fell by 2.9 years from 66.2 years in 1942 to 63.3 years in 1943.

Although the report lays bare the impact that the virus has had on life expectancy, the team behind the report said other factors also played a role, including an increase in deaths due to diabetes and accidental injuries, such as drug overdoses.

Diabetes deaths topped 100,000 for the first time, Anderson said, and accidental or unintentional injury deaths, such as drug overdoses, topped 200,000.

However, he said that COVID-19 is undoubtedly the biggest reason for the decline.

According to the report, there were more than 3.38 million deaths in the U.S. last year, about 530,000 more than there were in 2019.

Of that 3.38 million, more than 350,000 deaths were attributed to COVID-19, meaning 10.4% of all deaths in 2020 were caused by the virus.

“I can tell you it’s the primary driver in the decline in life expectancy and the increase in mortality,” Anderson said. “We’re talking about 350,000 deaths. That accounts for the bulk of the increase in morality — the overwhelming majority.”

Men saw a bigger decrease in life expectancy, losing 2.1 years — from 76.3 in 2019 to 74.2 in 2020 — compared to a decline of 1.5 years — from 81.4 in 2019 to 79.9 in 2020 — for women.

COVID-19 was the third leading cause of death in 2020, responsible for 85 deaths per 100,000 people.

Anderson said it is the first time a new disease has entered the top 10 leading causes of death so quickly.

“A disease that comes out of nowhere and ends up in the top 10 or top five? You’d have to go back to the early days of the HIV epidemic to see something similar.”

He said HIV never got higher than the eighth-leading cause of death and, even then, it took a few years after the virus was first identified before it reached the top 10.

“This is sort of similar, but even more dramatic, because in one year it goes from nothing to the third-leading cause of death,” Anderson added. “Remarkable.”

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(NEW YORK) — With millions of Americans set to travel and gather for Christmas and the New Year, families across the country are scrambling to try to ensure they are adequately protected against the coronavirus.

Experts suggest a confluence of factors is likely driving the country’s case rate up amid the surge of the omicron variant, most notably the millions of Americans who remain unvaccinated.

Many of those who have yet to get the shot are children, despite the fact that in the U.S. anyone over the age of 5 is eligible for the vaccine. Pfizer shots were authorized by the Food and Drug Administration for those 5 to 11 at the end of October, 12 to 15 in May and are fully approved for those 16 and older.

Since the emergence of the delta variant, children have been a significant driving factor behind the nation’s latest coronavirus surges, accounting for about a quarter of the nation’s reported weekly COVID-19 cases. Since July, more than 3.3 million have tested positive for the virus, representing 1 in every 4 cases, according to data from the American Academy of Pediatrics and the Children’s Hospital Association. In addition, the U.S. has not seen a week with fewer than 100,000 new pediatric cases since early August.

Now, given the potential for the highly transmissible omicron variant to cause an even greater wave of infections, experts say it is more critical than ever for children to be vaccinated in order to protect them and those around them, from severe disease and hospitalization, despite the fact that severe illness remains generally uncommon among children.

“[Omicron’s] increased transmissibility makes it possible that we’ll see very high case numbers in children, especially if they remain unvaccinated,” Dr. Kristin Moffitt, an infectious disease specialist at Boston Children’s Hospital told ABC News. “Even if severe infection remains relatively uncommon in children, if case numbers in children skyrocket, we’ll see many more pediatric hospitalizations.”

Earlier this week, the Centers for Disease Control and Prevention reported that models, which estimate the epidemic trajectory of coronavirus in the U.S., suggest that the new COVID-19 infections are likely to surge in the weeks to come and could exceed previous peaks, due to omicron.

“One of the fundamental drivers of ongoing community transmission is that there remains a significant portion of our population that is not immune to COVID,” C. Buddy Creech, director of the Vanderbilt Vaccine Research Program and associate professor of pediatric infectious diseases, told ABC News.

More than 90 million Americans are currently unvaccinated — including 51 million children under the age of 18.

Child COVID-19 cases on the rise again

Since the onset of the pandemic, nearly 7.4 million children and adolescents have tested positive for coronavirus, and in the last week alone, approximately 170,000 pediatric cases were reported, according to a new report from AAP and CHA, released on Monday.

“I think it is concerning to see these rates increasing,” Dr. Lee Beers, the AAP president, told “GMA3” on Tuesday. “It’s been a long, almost two years, and everyone is tired and everyone is frustrated and that’s all the more reason for us to be coming together to work together to really try to beat this thing and I think our kids are struggling.”

Since the first week of September, there have been nearly 2.3 million child cases — nearly a third of the total pediatric cases reported since the onset of the pandemic — and over the last month, pediatric COVID-19 related hospital admissions have increased by 33%, according to federal data.

“As children make up a larger portion of the unvaccinated population, they will account for a higher percentage of cases,” added Moffitt.

Although young people have largely been spared from acute COVID-19 illness, experts stress that children are not immune from the virus. According to the CDC, children are as likely to be infected with COVID-19 as adults and the virus now one of the top 10 causes of death for children ages 5 through 11 years.

There continues to be the misconception, among some, that children and teenagers may not be as severely affected by COVID-19 as adults, explained Creech. While that seemed to be the case early on in the pandemic, the delta variant proved otherwise.

“We began to see far more infections in children, some of which were severe. In addition, we continue to see long COVID, myocarditis, and multisystem inflammatory syndrome in children who appear to have very mild symptoms at the outset,” said Creech.

Pediatric COVID-19 vaccination rates continue to lag

With less than a third of the pediatric population — those under 18 — fully vaccinated, officials, health experts and pediatricians alike have been urging parents to get their children vaccinated.

“If your child is five years of age and older, please get them vaccinated. We need to protect the children,” Dr. Anthony Fauci, chief medical adviser to the White House, told George Stephanopoulos on ABC News’ “This Week” earlier this month. “This idea that children are not vulnerable at all is not so.”

President Joe Biden echoed Fauci’s sentiment on Tuesday, pleading with all families to get their “children protected today.”

“If your children are not vaccinated, please get them vaccinated,” Biden said. “If you’re a parent, understandably you waited – to see how the first shots went with other kids, before getting your own kid vaccinated, you can stop waiting.”

However, about two-thirds of parents of elementary school-aged children are either holding off on getting their younger children vaccinated or refuse to do so, according to another recent Kaiser Family Foundation poll, conducted before the discovery of omicron.

The safety profile of the Pfizer vaccine for eligible children remains “very reassuring,” added Moffit.

Earlier this month, CDC Director Dr. Rochelle Walensky told ABC News that real-world monitoring revealed vaccines are safe for young children.

Notably, the agency has yet to identify any concerns with the temporary heart inflammation known as myocarditis, a potential side effect of mRNA vaccines seen in rare circumstances in teenagers and young adults.

“We haven’t seen anything yet,” Walensky told ABC News Chief Medical Correspondent Dr. Jennifer Ashton. “We have an incredibly robust vaccine safety system, and so if [problems] were there, we would find it.”

Concerns over omicron

There is still not enough data to indicate how omicron will affect children, or whether it will potentially cause severe illness, compared to earlier variants.

Preliminary evidence indicates that omicron spreads at a rate two to three times faster than the delta variant, which experts say could result in a surge in COVID-19 cases, particularly among the unvaccinated.

“With delta, and now with omicron, we see the virus seeking and finding those who are either unvaccinated or whose circulating antibody levels have waned,” Creech explained.

Preliminary data from South Africa estimates that children had a 20% higher risk of hospitalization in the country’s omicron-driven fourth wave, given the fact that so many children were still unvaccinated, and therefore, unprotected.

In addition to the significant number of children and teenagers who are still unvaccinated, there is a large number of children under the age of five who are not yet eligible for the vaccine.

Late last week, the potential timeline for vaccines for children under 5 was pushed back after early data suggested that two lower doses of the Pfizer vaccine was not as effective for kids ages 2 to 5 as it was for the 16 to 25 population. Thus, scientists will add a third dose and see if the vaccine is as effective. Authorization for those 5 and younger may not come until the second quarter of 2022.

Experts therefore say it is critical for all those eligible to get vaccinated, in order to protect children who are still too young to get the shot.

“Vaccination will prevent infections, and fewer infections will mean lower transmission. Vaccinating everyone in a household who is able to be vaccinated will bring an added layer of protection to the entire household,” said Moffit.

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