Health
Childhood Vaccination Rates Were Falling Even Before the Rise of R.F.K. Jr.
After years of holding steady, American vaccination rates against once-common childhood diseases have been dropping.
Source: Centers for Disease Control and Prevention
Share of U.S. kindergartners
vaccinated against …
Nationwide, the rate of kindergartners with complete records for the measles vaccine declined from around 95 percent before the pandemic to under 93 percent last year, according to the Centers for Disease Control and Prevention. Immunization rates against polio, whooping cough and chickenpox fell similarly.
Average rates remain high, but those national figures mask far more precipitous drops in some states, counties and school districts.
In those areas, falling vaccination rates are creating new pockets of students no longer protected by herd immunity, the range considered high enough to stop an outbreak. For a community, an outbreak can be extremely disruptive. For children, measles and other once-common childhood diseases can lead to hospitalization and life-threatening complications.
Prepandemic is the average of 2017-18, 2018-19 and 2019-20 data, though not all years were available for all states. Alabama, Florida, Georgia, Iowa, Mississippi, New Hampshire, New Jersey and Delaware (in 2024) report the rate of students who have completed all required vaccines, not just the measles series. Source: Centers for Disease Control and Prevention
Change in kindergarten measles vaccination rates
Immunization rates fell in most states early in the pandemic, and continued to fall in the years that followed.
States, not the federal government, create and enforce their own vaccine mandates, but the incoming Trump administration could encourage anti-vaccine sentiment and undermine state programs. The president-elect’s nominee for health secretary, Robert F. Kennedy Jr., has spread the false theory that vaccines cause autism, among other misinformation.
But immunization rates had been falling for years before Mr. Kennedy’s recent political rise.
There are now an estimated 280,000 kindergartners without documented vaccination against measles, an increase of some 100,000 children from before the pandemic.
“These pockets are just waiting for an introduction of measles,” said Dr. William Schaffner, an infectious disease specialist at Vanderbilt University Medical Center. “It’s trouble waiting to happen.”
Why rates are falling
As the pandemic strained trust in the country’s public health system, more families of kindergartners formally opted out of routine vaccines, citing medical, philosophical or religious reasons. Others simply didn’t submit proof of a complete vaccination series, for any number of reasons, falling into noncompliance.
The shifts in exemptions mostly fall along political lines. In states that supported Mr. Trump for president in November, the number of students with official exemptions have increased on average (rising everywhere but West Virginia). Exemption rates rose in a few states that supported Vice President Kamala Harris — including Oregon, New Jersey and Minnesota — but stayed relatively flat or fell in most.
Includes medical and nonmedical exemptions. Montana was excluded due to lack of data. Wyoming is missing data for 2017-18. Delaware is missing data for 2019-20. West Virginia and Illinois are missing data for 2020-21. Source: Centers for Disease Control and Prevention.Share of kindergartners with a vaccine exemption
The pattern for noncompliance looks different: The rate of children with no vaccination record shot up in both red and blue states.
Not all children with missing records are unvaccinated. Some are in the process of getting their shots, delayed because of the pandemic, and others just never submitted documentation. Schools are supposed to bar out-of-compliance students from attending, but whether they do varies from state to state and school to school.
Montana was excluded due to lack of data. Wyoming is missing data for 2017-18. Delaware is missing data for 2019-20. West Virginia and Illinois are missing data for 2020-21. Alaska is missing data for 2018-19, 2019-20 and 2020-21. Source: Centers for Disease Control and Prevention.Share of kindergartners with no recorded vaccination, and no exemption
Surveys reveal a new and deep partisan division on this issue. In 2019, 67 percent of Democrats and Democratic leaners told Gallup that childhood immunizations were “extremely important,” compared with 52 percent of their Republican counterparts. Five years later, the enthusiasm among the Democratic grouping had fallen slightly to 63 percent. For Republicans and G.O.P. leaners it had plunged to 26 percent.
Today, 31 percent of Republicans say “vaccines are more dangerous than the diseases they were designed to protect.” Just 5 percent of Democrats say the same.
“There seems to be a divide in terms of people’s feelings about science and skepticism towards the government,” said Dr. Natasha Bagdasarian, chief medical executive for Michigan. “I think some of those divisions are becoming apparent in vaccination rates.”
Lawmakers in numerous states have tried to roll back school vaccine mandates, but most changes have been minor: Louisiana required schools to pair any mandate notifications with information about exemption laws; Idaho allowed 18-year-old students to exempt themselves; and Montana stopped collecting data from schools on immunizations.
But there are a few places where state-level policy changes, or lack thereof, appear to have had a direct effect on rates.
In Mississippi, which had long held the country’s highest kindergarten measles vaccination rate, a federal judge ordered the state to allow religious objections; the state’s vaccination rate fell. In contrast, West Virginia’s governor vetoed a bill that would have loosened school vaccine policy; the state now has the highest rate.
Rates rose in Maine and Connecticut, two states that eliminated nonmedical exemptions during the pandemic. They also rose in Alabama, according to C.D.C. data, though the state declined to comment on why.
Vulnerable pockets
Epidemiologists say that when vaccination rates slip under 90 percent for measles, outbreaks become significantly harder to contain. At some point below that, spread becomes almost inevitable if measles is introduced.
There are thousands more schools with vaccination rates below 90 percent compared with just five years ago, according to a New York Times analysis of detailed data from 22 states.
*Texas counts districts, not individual schools.
Most states publish measles, mumps and rubella (MMR) vaccine rates, but several publish only how many students complete all mandated shots. Most states exclude schools with small numbers of students. Most states publish rates for kindergartners only; for several states, however, these rates represent entire schools. New York data excludes N.Y.C. public schools. Source: state governments.
Change in share of schools with vaccination rates below 90 percent
Schools with falling rates can be found in red and blue states, in large urban districts and in small rural ones.
Measles vaccination rates dropped from 83 percent to 75 percent in Yavapai County in Arizona; from 93 percent to 78 percent in Pacific County on the coastline of Washington; from 97 percent to 93 percent in Union County, N.J., just outside New York City — places that span the political spectrum.
These numbers capture vaccination rates only for kindergartners, often partway through the school year, so they include students who may have finished their vaccine series later or will go on to finish it. And across the U.S., most students remain protected against childhood diseases.
But high rates nationally don’t help places no longer protected by herd immunity, as evidenced by recent outbreaks of childhood diseases. Measles and whooping cough cases both climbed last year; polio partly paralyzed a man in New York in 2022.
Growing anti-vaccine sentiment is only part of the public health challenge. In the Minneapolis public schools, completion rates for the measles, mumps and rubella vaccine among kindergartners dropped from around 90 percent to 75 percent. The district’s exemption rate barely moved; instead, far more students had incomplete vaccination records.
Few of those students’ families are strongly anti-vaccine, said Luisa Pessoa-Brandao, director of public health initiatives with the Minneapolis Health Department. Some are immigrants who moved into the district recently, missing either shots or records. Others missed regular doctor visits during the pandemic and got out of the habit of preventative care.
“I think we’re going to be catching up for a while,” Ms. Pessoa-Brandao said.
While vaccination rates were dropping in Minneapolis, they climbed in neighboring St. Paul Public Schools, from around 91.4 percent to around 93 percent, according to state data.
The district attributed the rise to strict new procedures started in 2021, including letters and phone calls to families in their native languages; more vaccines available on district grounds; and monthly compliance reports — an extra mile that not every district is able or willing to go.
There are still parents who opt out. But during a measles outbreak last year, a few changed their mind, said Rebecca Schmidt, the St. Paul district’s director of health and wellness.
“The fear of measles,” she said, “is sometimes greater than the ease” of getting an exemption.
Data for all 50 states
Kindergarten measles vaccination rate
Source: Centers for Disease Control and Prevention. For some years in some states, the rate represents a complete vaccine series, not just the measles vaccine.
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For women over 60, muscle strength plays a critical role in longevity, a new study confirms.
Researchers at the University at Buffalo, New York, followed more than 5,000 women between the ages of 63 and 99, finding that those with greater muscle strength had a significantly lower risk of death over an eight-year period.
The findings were published in JAMA Network Open.
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Muscle function was measured using grip strength and how quickly participants could complete five unassisted sit-to-stand chair raises.
These are two tests commonly used in clinical settings to evaluate muscle function in older adults, the researchers noted.
A recent study shows that stronger muscle strength in women over 60 is linked to a lower risk of death over eight years. (iStock)
“In a community cohort of ambulatory older women, muscular strength was associated with significantly lower mortality rates, even when we accounted for usual physical activity and sedentary time measured using a wearable monitor, gait speed and blood C-reactive protein levels,” study lead author Michael LaMonte, research professor of epidemiology and environmental health at the University at Buffalo, told Fox News Digital.
“Movement is the key — just move more and sit less.”
Many earlier studies did not include those objective measurements, making it difficult to determine whether muscle strength itself was linked to longevity, according to LaMonte. “Our study was able to better isolate the association between strength and death in later life,” he added.
Even for women who don’t get the recommended amount of aerobic physical activity, which is at least 150 minutes per week, muscle strength remained important for longevity, the researchers found.
Women with greater muscle strength were more likely to live longer, even if they did not meet the recommended amount of aerobic exercise. (iStock)
“The findings of lower mortality in those who had higher strength but were not meeting current national guidelines on aerobic activity were somewhat intriguing,” LaMonte said.
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Federal guidelines recommend strengthening activities one to two days per week, targeting major muscle groups.
Resistance training does not have to require a gym membership, LaMonte noted. These exercises can be performed using free weights, resistance bands, bodyweight movements or even household items, such as soup cans.
Experts recommend working major muscle groups one or two days a week using weights, bands or bodyweight exercises. (iStock)
“Movement is the key — just move more and sit less,” he said. “When we can no longer get out of the chair and move around, we are in trouble.”
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LaMonte acknowledged several limitations of the study. The researchers assessed muscle strength in older age but did not explore how earlier levels in adulthood might influence long-term health outcomes.
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“We were not able to understand how strength and mortality relate in younger ages,” he said, noting that future research should explore whether building strength earlier could have an even greater impact on longevity.
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Compounds found in cannabis could provide a new roadmap for treating the world’s most common chronic liver disorder, according to a study released by the Hebrew University of Jerusalem.
The research, published in the British Journal of Pharmacology, found that cannabidiol (CBD) and cannabigerol (CBG) significantly reduced liver fat and improved metabolic health in experimental models.
CBD is the more widely studied non-intoxicating cannabinoid, while CBG is a less common “precursor” cannabinoid from which CBD is formed.
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Unlike THC, the primary psychoactive component in cannabis, these compounds do not produce a “high,” making them viable candidates for long-term medical treatment, the study suggests.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population, according to health data.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population. (iStock)
The condition, which is closely linked to obesity and insulin resistance, has few approved pharmaceutical treatments, the researchers said, leaving patients to rely largely on lifestyle changes that can be difficult to maintain.
“Our findings identify a new mechanism by which CBD and CBG enhance hepatic energy and lysosomal function,” said lead study author Joseph Tam, director of the Multidisciplinary Center for Cannabinoid Research at Hebrew University, in a press release.
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The study highlights a process called “metabolic remodeling,” in which the cannabis compounds created a “backup battery” for the liver by increasing levels of phosphocreatine, a high-energy molecule stored in muscle cells.
This energy reserve helps the organ function under the stress of a high-fat diet, which was an unexpected discovery, the team noted.
Researchers focused on CBD and CBG, two non-psychoactive compounds that offer therapeutic benefits without the “high” associated with THC. (iStock)
The researchers also found that CBD and CBG restored the activity of “cellular cleaning crews” known as cathepsins, enzymes that work within the cell’s recycling centers to break down harmful fats and waste.
With this process, the liver was better able to clear out dangerous lipids, including triglycerides and ceramides, which are known to trigger inflammation, the study showed.
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While both compounds were effective, CBG showed more robust results in certain areas, such as reducing total body fat mass, lowering “bad” LDL cholesterol and improving insulin sensitivity.
Researchers say this study opens a new path for using plant-based compounds to treat metabolic diseases by focusing on how cells manage energy and waste.
The discovery of a phosphocreatine “backup battery” in the liver marks a significant shift in how scientists understand the organ’s ability to survive high-fat diets. (iStock)
Limitations and caveats
Despite the promising results, the research team cautioned that the study was conducted in a controlled experimental environment. Further clinical trials are necessary to determine the proper application for human patients.
Other recent studies have pointed to potential issues with using cannabis as a medical tool.
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A major analysis published in JAMA examined more than 2,500 scientific papers from the last 15 years, including other reviews, clinical trials and guidelines focused on medical marijuana.
The 2025 review highlighted significant gaps between public perception and scientific evidence regarding cannabis’ effectiveness for most medical conditions.
Other recent studies have pointed to issues with the efficacy of cannabis as a medical tool. (iStock)
The researchers concluded that there are very few conditions for which cannabinoid therapies have clear, well-established benefits backed by high-quality clinical data.
“Whenever a substance is widely used, there is likely to be a very wide set of outcomes,” Alex Dimitriu, MD, who is double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine, previously told Fox News Digital. “This study points to the reality that this widely used substance is not a panacea.”
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The strongest evidence supports FDA-approved cannabinoid medications for treating specific conditions, including HIV/AIDS-related appetite loss, chemotherapy-induced nausea and vomiting, and certain severe pediatric seizure disorders, according to the review.
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Anyone interested in using marijuana for medical purposes should speak to a healthcare provider to discuss potential risks and benefits.
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While cannabis has recently come under fire for potential negative health risks, a recent study suggests that its use could increase brain volume and cognitive fitness.
Researchers at the University of Colorado Anschutz Medical Campus analyzed cannabis usage, brain scans and cognitive test results for more than 26,000 adults between the ages of 40 and 77, using data from the UK biobank.
The study found that cannabis users — particularly those who reported moderate lifetime usage — showed larger volumes in several brain regions.
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“Compared to individuals with no history of cannabis use, those who reported using cannabis showed larger volumes in several brain regions characterized by a high density of cannabinoid (CB1) receptors — regions involved in processes such as memory, information processing and emotion regulation,” lead study author Anika Guha, Ph.D., a researcher at the University of Colorado Anschutz Medical Campus, told Fox News Digital.
A recent study suggests that cannabis use could increase brain volume and cognitive fitness. (iStock)
The cannabis users also scored better on cognitive tests that measured learning, processing speed and executive function.
This outcome differs from many previous studies, which have focused on short-term cognitive impairment during or shortly after cannabis use, the researcher pointed out.
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“These findings suggest that the relationship between cannabis and the brain may differ across the lifespan, and that moderate use in mid-to-later adulthood may be associated with positive brain health outcomes,” Guha said.
Not all areas of the brain showed positive effects among cannabis users. The posterior cingulate, which is involved in self-reflection and memory, had lower volume with higher marijuana use.
“The takeaway is not that people should start using more cannabis based on these findings alone.”
As cannabis has been rising in popularity among all ages, this type of study is important for understanding its long-term effects and the pros and cons of use, according to Matt Glowiak, Ph.D., chief addiction specialist with Recovered, an organization that provides information and resources for mental health and addiction treatment.
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability. (AP Photo/Martin Meissner, File)
“Given the connection between cannabis use and larger brain volume, it is believed that it may help [older] individuals retain cognitive function that might otherwise naturally decline,” Chicago-based Glowiak, who was not involved in the study, told Fox News Digital.
“This is a huge benefit, but one we need to explore a bit further, ahead of encouraging those who would otherwise not consider integrating cannabis into their healthcare regimen.”
Limitations and caveats
As the study was observational in nature, it could not prove that cannabis use improves brain health — instead, it only showed an association, according to Dr. Marc Siegel, Fox News senior medical analyst, who was not involved in the study.
“The preponderance of previous evidence does not line up with improved cognitive function from chronic cannabis use,” Siegel told Fox News Digital. “This study is an outlier, and though it cannot be ignored, it is not justification for use.”
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The study also relied on the UK Biobank, which offers a “large and rich dataset,” Guha said — but it is limited to the questions that were originally posed to the participants.
“In particular, we have only a broad measure of how many times someone has used cannabis over their lifetime,” she said. “We do not have access to details about how they used cannabis, such as whether they smoked or used edibles, the type or potency of cannabis, or when in their life they used most heavily.”
Cannabis users scored better in learning, processing speed and executive function. (iStock)
“Those details likely matter a great deal for understanding how cannabis affects the aging brain.”
Given these limitations, Guha suggests that the findings should be seen as an early indicator that cannabis use may be related to brain aging, “and as a starting point for more targeted research that can tease apart these relationships.”
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“The takeaway is not that people should start using more cannabis based on these findings alone,” she emphasized. “While cannabis may have potential benefits in some contexts, a substantial body of research also documents important risks, underscoring that cannabis is neither completely beneficial nor completely harmful.”
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability, according to Guha.
“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” one expert said. (AP)
“As with any substance, individuals should consult with a healthcare provider before initiating use, particularly if they have a history of mental health concerns, as THC (the primary psychoactive component of cannabis) can exacerbate symptoms such as psychosis in vulnerable individuals,” she added.
Dr. Alex Dimitriu, who is double board-certified in psychiatry and sleep medicine and the founder of Menlo Park Psychiatry & Sleep Medicine, reiterated that this study is an “outlier,” as most previous research has shown “detrimental effects” from cannabis use.
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“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” he said. “I would advise proceeding with caution and moderation.”
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Dimitriu agreed that more large-scale studies and review papers are needed to get a “clearer picture.”
“What this cannabis study shows is that there may be conflicting information, which warrants more investigation.”
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