What the Measles Surge Means for U.S. Public Health—and Your Family

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In 2025, the United States surpassed 2,000 confirmed measles cases, marking the worst year for the disease in more than three decades. As of December 30, 2025, the CDC had documented 2,065 cases across 42 states, with 49 separate outbreaks reported throughout the year. In 2024, the entire year saw only 285 cases. The surge represents roughly a seven-fold increase in measles infections in one year.

In 2000, the United States declared measles eliminated, meaning the disease was no longer continuously circulating in the population. It was a monumental achievement, a direct result of decades of sustained vaccination efforts and millions of parents vaccinating their children according to routine schedules. For the past quarter-century, measles was something Americans read about in history books or saw in coverage of outbreaks in other countries.

Declining vaccination rates, the spread of vaccine exemptions, disruptions from the COVID-19 pandemic, and clusters of unvaccinated communities have created the conditions for measles to establish itself again. If current trends continue, the country could lose its measles elimination status—a development that would reshape how public health operates and reintroduce a disease that once killed hundreds of Americans annually.

Understanding the 2025 Measles Surge

The 2025 outbreak didn’t emerge from nowhere. It arrived the way measles always does now: someone brought it back from travel to a country where measles is still circulating, and it landed in a community where enough people were unvaccinated that it could spread.

The outbreak began in early January 2025 in close-knit communities across New Mexico, Oklahoma, and Texas—specifically in religious and cultural communities with historically low vaccination rates. By mid-April, roughly 800 cases had already been documented in the first 16 weeks of the year, with 82 percent of those concentrated in these states.

What made this outbreak different from sporadic imported cases is that it didn’t fizzle out after a few dozen infections. Instead, it sustained itself within these connected communities, spreading through households and religious gatherings where vaccination coverage was far below the 95 percent threshold needed to stop measles transmission.

Among the 2,065 cases documented by year’s end, 26 percent were children under five years old, and 42 percent were children and teens aged 5 to 19, with the remaining 32 percent occurring in adults aged 20 and older. Children ages 5 to 19 represented the single largest affected age group.

93 percent of all cases occurred in people who were either unvaccinated or had unknown vaccination status. This wasn’t a vaccine failure outbreak. It was an outbreak of unvaccinated populations.

Vaccination rates have been declining for years, a trend that accelerated during the COVID-19 pandemic and hasn’t fully recovered. In the 2019-2020 school year, 95 percent of kindergarteners had received the MMR vaccine nationally. By the 2024-2025 school year, that had dropped to 92.5 percent.

That 2.5 percentage point decline means roughly 280,000 more kindergarteners lack full protection compared to five years ago. More alarmingly, 39 states now have kindergarten MMR vaccination rates below 95 percent, up from 28 states before the pandemic.

The pandemic disrupted routine childhood vaccinations as families delayed doctor visits and health departments redirected resources. Many families never resumed their prior vaccination schedules. Vaccine hesitancy increased, fueled by misinformation on social media and increasingly polarized discussions about medical choice. Some parents sought exemptions from vaccination requirements. Others lacked access to vaccines or didn’t prioritize them in a crowded schedule.

A study examining why children missed vaccinations found that youngsters who didn’t receive their routine 2-month vaccines were far less likely to be up to date on MMR by age 2, creating cascading gaps in protection.

Non-medical exemptions from school vaccination requirements have been rising. The share of kindergarteners with any exemption rose from 2.5 percent in the 2019-2020 school year to 3.6 percent in 2024-2025. Most of this increase came from non-medical exemptions, which jumped from 2.2 percent to 3.4 percent over the same period.

In 17 states, more than 5 percent of kindergarteners claimed an exemption—up from nine states five years earlier. These aren’t randomly distributed. They cluster in specific communities, creating pockets of vulnerability that measles can exploit.

Vermont had one of the highest exemption rates in the nation. Idaho had the lowest kindergarten MMR vaccination coverage at 78.5 percent, nearly 17 percentage points below the level needed for herd immunity. Some rural and wealthy suburban communities have vaccination rates in the 60s and 70s. Meanwhile, Connecticut maintained 98.2 percent coverage.

International travel continues to be the primary way measles enters the country. As of the end of 2025, 24 of the measles cases reported were from international visitors, while many more came from U.S. residents who contracted measles while traveling abroad. Rising measles rates abroad directly affect measles rates here.

Measles Elimination Status

The term “measles elimination” means the disease isn’t spreading from person to person anymore within the country for 12 or more consecutive months. When cases occur, they’re isolated. They don’t turn into sustained chains of transmission. The virus doesn’t establish itself.

The country achieved this status in 2000 after decades of high vaccination coverage. An external panel of experts convened by the CDC reviewed available data and epidemiological evidence and concluded that all criteria for elimination had been met. In 2011 and 2012, another external expert committee reviewed the evidence and confirmed that elimination had been maintained.

In November 2024—before the massive 2025 surge—the Pan American Health Organization confirmed that the U.S. has maintained measles elimination.

Maintaining elimination status requires sustained effort. The criteria used to verify elimination include high childhood vaccination coverage (consistently above 90 percent nationally, with no sustained low-coverage areas), rapid identification and investigation of suspected cases, thorough surveillance, and the rapid interruption of transmission chains. No measles lineage has circulated continuously in a single transmission chain for more than 12 months since elimination was declared.

This status is fragile. It can be lost.

The Americas achieved measles elimination as a region in 1994, several years before the U.S. But measles became reestablished in Venezuela starting in 2018 and subsequently spread to Brazil in 2019. Those outbreaks involved thousands of cases and caused measles to re-establish ongoing circulation in countries that had eliminated it.

The U.S. came close to this scenario in 2019, when nearly 1,300 measles cases occurred mostly in and around New York, with cases spread across 30 different states. That outbreak was contained through aggressive public health response.

If the U.S. loses elimination status, several things change. Internationally, the country loses credibility in global health leadership and measles elimination efforts. Domestically, the loss of status signals a fundamental shift in the public health environment. It means measles is now considered present in the population—a disease that routinely circulates and must be actively managed.

Healthcare resources that have focused on other priorities would need to shift toward measles surveillance, outbreak response, and vaccination campaigns. Insurance and healthcare costs could shift as well, with measles care becoming a standard rather than exceptional burden on the health system.

2025’s numbers are approaching or exceeding the thresholds that would prompt a loss of status consideration. There have been 49 outbreaks reported in 2025, compared to 16 in 2024. Nearly 88 percent of cases (1,820 of 2,065) were outbreak-associated, meaning they weren’t isolated introductions but were connected to sustained chains of transmission. Some epidemiological models suggest that if measles sustains transmission continuously for another 12 months in certain communities, the country could formally lose its elimination status, triggering an international declaration that would fundamentally change how measles is viewed in public health policy.

Why Measles Is Dangerous

Before vaccines existed, measles was a defining part of childhood. Nearly every child got it. It killed hundreds of Americans every year and left others with permanent brain damage, deafness, or other disabilities.

Measles is one of the most contagious human diseases known. How easily a disease spreads (scientists call this the R-number) is between 12 and 18 for measles. COVID-19’s original strain had an R-number around 2 to 3. Influenza typically ranges from 1 to 2. Measles’s R-number of 12-18 means that if one unvaccinated person with measles enters a room full of unvaccinated people, roughly 12 to 18 of them will contract it.

The virus lives in respiratory droplets. When an infected person coughs or sneezes, tiny viral particles become airborne. Those particles can remain infectious in an enclosed space for up to two hours after the person leaves the room. You don’t need face-to-face contact. You don’t need to touch anything. Breathing the same air within a few hours of an infected person can transmit the virus.

People are contagious for an extended window—from four days before the characteristic rash appears until four days after it appears. The early symptoms of measles look like a bad cold: fever (sometimes as high as 105 degrees Fahrenheit), cough, runny nose, and red, watery eyes. It takes two to three days after these initial symptoms for tiny white spots (called Koplik spots) to appear inside the mouth, and another two to three days before the characteristic rash appears on the face.

Someone can be spreading measles virally for days while thinking they have a cold, potentially infecting many others before anyone realizes what’s happening.

About 30 percent of measles cases result in complications. Pneumonia occurs in about one in 20 children with measles and is the most common cause of measles-related death in young children. Encephalitis (swelling of the brain) develops in about one in 1,000 children with measles and can cause permanent brain damage, deafness, or intellectual disability. Ear infections develop in roughly one in 10 children with measles.

One to two people per 1,000 who contract measles die from respiratory or neurologic complications.

If 100 people in your community get measles, one to two of them will die. One will develop encephalitis with potential permanent brain damage. Five will develop pneumonia.

A rare but fatal brain disease can develop years after measles: subacute sclerosing panencephalitis (SSPE). It’s an extremely rare but invariably fatal degenerative disease of the central nervous system that can develop seven to 11 years after a measles infection, even in someone who seemed to fully recover. It’s caused by chronic infection with the measles virus that slowly damages the brain. Children infected with measles before age 2 have the highest risk. Between 1989 and 1991, during the measles resurgence, between 7 and 11 out of every 100,000 people infected with measles were estimated to develop SSPE.

Studies published in 2019 found that measles infection impairs the body’s immune system for months or even years afterward, weakening your resistance to other infectious diseases. Researchers analyzed blood samples from children who had contracted measles and found “substantial reductions” in the diversity of antibodies protecting them against other pathogens. Children with severe measles lost a median of 40 percent of their preexisting pathogen-specific antibodies.

The MMR vaccine is highly effective at building immunity without triggering immune suppression. One dose is 93 percent effective at preventing measles. Two doses are 97 percent effective. If you’re vaccinated and somehow still get infected with measles (which is rare), your illness is typically much milder.

Young children, particularly those under 5, face the highest risk. Pregnant women who lack immunity face serious complications including pneumonia and premature delivery. Immunocompromised people—including those with cancer, HIV, or conditions that severely weaken the immune system—face life-threatening infection. Infants too young to be vaccinated (the first dose is recommended at 12 months) are vulnerable if exposed.

These vulnerable populations depend on vaccination levels in their communities staying high enough to prevent the virus from reaching them at all.

How to Know If Your Family Is Protected

The CDC recommends that children receive two doses of the MMR vaccine: the first dose at 12 to 15 months of age, and the second dose at 4 to 6 years of age, ideally before school entry. Those two doses, given at least 28 days apart, provide 97 percent protection against measles.

For adolescents and adults, the recommendations depend on when they were born and what vaccination history they have. People born before 1957 are generally considered to have lived through natural measles infection and are presumed immune. People born in or after 1957 should have documentation of either two doses of MMR vaccine, one dose of MMR plus a blood test showing immunity, a blood test confirming previous infection, or a blood test showing immunity to measles.

Healthcare workers, international travelers, and people in college dormitory settings face higher-risk exposure and should ensure they have two doses of the vaccine.

Many people don’t have clear documentation of their vaccination status. Vaccination records from childhood are often lost. A study of more than 321,000 children tracked electronic health records and found that only 78.4 percent of children received the first MMR dose on time, with 13.9 percent having delayed vaccination and 6.7 percent not vaccinated by age 2. For adults whose childhood vaccines predate electronic records systems, finding documentation is even harder.

If you don’t have written documentation of your MMR vaccination, start by checking with your pediatrician or family doctor—some practices maintain records for many years. Contact your state or local health department’s immunization program, as many states maintain immunization information systems where records are centralized. School health records sometimes contain vaccination documentation. If you had a measles test as an adult, that office should have records. Immunization registries exist in all 50 states, though their comprehensiveness varies significantly.

If you cannot find your records, getting the MMR vaccine again is safe. There is no harm in receiving additional doses of the vaccine if you may already be immune. You might ask your healthcare provider for a blood test that checks if you’re immune to measles, mumps, and rubella (a titer test). A positive result confirms you have immunity and don’t need vaccination. A negative result means you should get vaccinated.

If you’re pregnant and lack documented immunity to measles, you cannot receive the MMR vaccine during pregnancy because it contains a weakened form of the virus. However, you should receive the vaccine in the postpartum period, ideally before hospital discharge, even if you’re breastfeeding—the vaccine is safe for breastfeeding individuals.

If you have a baby under 12 months old and plan to travel internationally or there’s a measles outbreak in your area, your baby can receive an early dose of the MMR vaccine starting at 6 months of age. This dose doesn’t count toward the regular two-dose series; your baby will still need the standard first dose at 12-15 months and second dose at 4-6 years. The early dose is specifically intended to provide temporary protection in high-risk situations.

Those with HIV, leukemia, lymphoma, or other conditions affecting immune function should consult with their healthcare provider about MMR vaccination, as the live vaccine may not be appropriate for severely immunocompromised individuals. In outbreak situations, these individuals might be eligible for a blood product given after exposure that can prevent measles instead of vaccine.

Where to Get Vaccinated and What It Costs

Start with your regular healthcare provider—your pediatrician if you have children, or your family medicine doctor if you’re an adult. Providers typically stock the MMR vaccine and can administer it at a regular visit. You can combine the MMR vaccine with other routine vaccinations, so it doesn’t necessarily require a separate appointment.

If you don’t have a regular healthcare provider, pharmacies in most states can administer the MMR vaccine. CVS, Walgreens, and other major pharmacy chains offer vaccinations. Some pharmacies have age restrictions (typically vaccinating ages 18 and up), so call ahead to confirm. You don’t necessarily need an appointment, though scheduling one is advisable to minimize wait times.

Local health departments offer vaccinations, often at low cost or free. These are particularly valuable if you lack health insurance or have financial constraints. Community health centers (clinics that serve everyone regardless of ability to pay) provide primary care and vaccinations to people regardless of insurance status, using a sliding-scale fee based on income. To find one near you, you can visit the HRSA website or search online for “community health center near me.”

Schools sometimes organize vaccination clinics, particularly when measles outbreaks occur. If an outbreak is affecting your community, check with your child’s school to see if they’re coordinating vaccination efforts.

The CDC maintains a tool called Vaccines.gov that helps you find nearby vaccination providers by entering your zip code.

If you have private health insurance, the MMR vaccine should be covered with no copayment under the Affordable Care Act, which requires preventive services recommended by the CDC to be covered without cost-sharing. This applies to most private insurance plans.

If you have Medicaid, the vaccine is covered, and many providers accept Medicaid for vaccinations. If you have Medicare, the situation is more complex. Original Medicare doesn’t cover the MMR vaccine routinely for adults, though it does cover some vaccines like influenza and pneumococcal vaccines. However, Medicare Part D prescription drug plans are required to cover all vaccines recommended by the CDC at no cost.

For people without health insurance, the CDC’s Vaccines for Children (VFC) program provides vaccines at no cost to eligible children under 19 years of age. Eligibility includes uninsured children, Medicaid-eligible or Medicaid-enrolled children, American Indian or Alaska Native children, and underinsured children whose insurance doesn’t cover vaccines or has high copayments. This program serves millions of children annually and removes financial barriers to vaccination.

For uninsured adults, state health departments sometimes have programs providing free or low-cost vaccines to uninsured adults. Community health centers offer sliding-scale fees. Some employers provide vaccines to employees. If you’re uninsured, calling your local health department is the best first step.

Private pay costs, if you pay directly without insurance, typically run between $60 and $150 for an MMR vaccine, depending on the provider. It’s a one-time cost (per dose) and significantly less than the cost of treating measles complications.

At your appointment, expect a brief visit. The healthcare provider will confirm you haven’t had recent measles vaccine and ask basic screening questions about your health. The vaccine itself is a small injection, usually in the upper arm. Common side effects are minimal: soreness at the injection site, low-grade fever, or a mild rash. More serious side effects are extraordinarily rare. Protection begins approximately two weeks after vaccination, though some immunity develops sooner.

When an Outbreak Reaches Your Community

The CDC maintains a real-time outbreak tracker on its website showing current measles activity by state and jurisdiction. Your state health department website will have updates specific to your state. Local health departments send notifications to schools and healthcare providers when cases are detected. Increasingly, schools notify parents directly when there’s a potential exposure.

If you learn there’s a confirmed measles case in your community and you’re unvaccinated or unsure of your vaccination status, immediate action is warranted. The MMR vaccine can prevent measles if given within 72 hours of exposure. Call your healthcare provider, pharmacy, or health department immediately to get vaccinated. The window is narrow.

If you cannot access the vaccine within 72 hours and you were exposed to measles, there’s another option: immunoglobulin, a blood product containing antibodies against measles. If administered within six days of exposure, it can prevent or significantly modify measles infection. This requires a doctor’s prescription and administration at a clinic or hospital, so call your health department or healthcare provider immediately.

If you’re vaccinated or believe you have immunity and are exposed to measles, the risk to you is low. You’re roughly 97 percent protected with two doses of vaccine. Even cases where vaccinated people still get the disease tend to be much milder than infections in unvaccinated people.

Measles symptoms begin 7 to 14 days after exposure. Initial symptoms are fever (potentially spiking above 104 degrees), cough, runny nose, and red, watery eyes. Two to three days into illness, tiny white spots appear inside the mouth. Three to five days after initial symptoms, the characteristic rash appears, usually starting on the face near the hairline and spreading downward over the course of several days.

If you develop fever and respiratory symptoms after a measles exposure, call your healthcare provider before going to their office or emergency room. Tell them about the measles exposure so they can take appropriate precautions to prevent transmission to other patients and staff. Measles patients should be isolated to prevent spread. Healthcare workers need to use respiratory protection (N95 masks) when caring for suspected or confirmed measles patients.

A person with measles should remain isolated at home from four days before the rash appears until four days after it appears. For people in healthcare settings, specific precautions apply. Unvaccinated people exposed to measles may be excluded from school or childcare for up to 21 days after their last exposure to prevent them from potentially incubating the virus and transmitting it to vulnerable populations.

School Requirements, Exemptions, and What Parents Need to Know

Every state requires children to be vaccinated against measles before school entry, but every state also allows exemptions.

All 50 states and Washington, D.C. allow medical exemptions from vaccination requirements. A medical exemption is appropriate when a child has a genuine medical contraindication—for example, severe allergic reaction to a vaccine component, conditions that severely weaken the immune system, or pregnancy (though pregnancy wouldn’t apply to school-age children). Medical exemptions are typically documented by a physician and are legitimate.

Forty-seven states (including D.C.) allow religious or personal belief exemptions. The specifics vary by state. Some allow religious exemptions only. Some allow philosophical belief exemptions. Some allow both under the same category. A few states distinguish between them.

In 47 states, a parent can decline the MMR vaccine based on personal belief without needing to demonstrate a medical reason.

In the 2024-2025 school year, 3.6 percent of kindergarteners nationally had an exemption from at least one required vaccine, up from 2.5 percent in 2019-2020. Non-medical exemptions accounted for essentially all of this increase—rising from 2.2 percent to 3.4 percent over five years. In a school with 500 kindergarteners, roughly 17 are unvaccinated due to exemptions.

Exemption rates are highly geographically concentrated. Seventeen states now have exemption rates exceeding 5 percent. In some communities, exemption rates reach 10, 15, or even 20 percent, creating clusters of unvaccinated children that become high-risk zones for measles transmission.

When the 2019 measles outbreak occurred, New York changed its school vaccination law to eliminate non-medical religious exemptions. The result was dramatic: in Rockland County, where exemptions had been common, compliance rates jumped to nearly 98 percent after the policy change. This demonstrated that exemption rates are policy-dependent.

If you’re a parent deciding whether to exempt your child from the MMR vaccine, understand that this is a high-stakes choice. You’re making a decision not for your child alone, but one that affects entire communities. Unvaccinated children don’t face personal risk alone; they become vectors for transmission to babies too young to vaccinate, immunocompromised classmates, and other vulnerable people.

When the 2025 measles outbreak occurred, some schools saw student absences surge 71 percent among young children as unvaccinated or exposed students were excluded from school. An unvaccinated child attending school when measles is present creates disruption far beyond that single student.

If you have sincere religious or philosophical concerns about vaccination, talk with your healthcare provider about the risks and benefits. The MMR vaccine has an extraordinarily strong safety record, developed and monitored over decades. It doesn’t cause autism—this claim originated in a fraudulent 1998 study that has since been retracted and thoroughly debunked.

What Government Is Doing to Respond

At the federal level, the CDC serves as the primary coordinator and information source. The agency maintains real-time surveillance of measles cases, tracks outbreaks, provides technical assistance to state health departments, maintains national vaccine supply information, and publishes guidance for healthcare providers and the public. In 2025, the agency issued multiple health alerts urging healthcare providers to screen for measles, report suspected cases immediately, and ensure staff have evidence of immunity.

State health departments lead outbreak investigation and response in their jurisdictions. When a suspected measles case is identified, the state health department works to confirm diagnosis through laboratory testing, identifies close contacts, notifies potentially exposed individuals, and may recommend vaccination or post-exposure prophylaxis. State health departments also coordinate with schools and childcare facilities when outbreaks occur.

Local health departments provide frontline outbreak response, often including door-to-door contact tracing, vaccination clinics, and community education. When the 2025 outbreak hit New Mexico, Oklahoma, and Texas, local health departments mounted massive vaccination efforts in affected communities.

The FDA ensures the MMR vaccine supply is adequate and monitors vaccine safety through a system where doctors report any health problems that happen after vaccination. While these reports can include any adverse event that happens after vaccination, more rigorous analysis is performed using other surveillance systems to determine whether the vaccine caused reported problems.

Some communities are resistant to vaccination messaging. Some local health departments are underfunded and lack capacity for aggressive outbreak response. The federal government’s ability to mandate specific response approaches is limited. State policies on school vaccination requirements vary, and efforts to strengthen those requirements face political opposition.

Maintaining or recovering measles elimination status requires increased vaccination rates, particularly in communities with clusters of unvaccinated people; reduced exemption rates through policy changes; continued surveillance and rapid response to cases; and sustained public health messaging about vaccine safety and efficacy.

Why This Happened

Vaccine hesitancy has been rising for years, fueled by misinformation about vaccine safety—particularly the debunked link between MMR vaccine and autism. Social media algorithms amplify vaccine skepticism. COVID-19 pandemic discussions about vaccines became highly polarized, and that polarization spilled over into discussions of routine childhood vaccines.

Some parents have become convinced that “natural immunity” from infection is superior to vaccine-induced immunity—a belief contradicted by recent immunology research showing that vaccination produces better immunity without the dangers of infection.

Routine pediatric vaccine coverage dropped in 2020 and early 2021, and recovery has been incomplete and uneven. Some families didn’t return to regular pediatric care. Others faced barriers of access or cost. The pandemic created delays that compounded over time.

The expansion of non-medical exemptions in various states provided a mechanism for vaccine hesitancy to translate into unvaccinated children. Some states that previously had more restrictive exemption policies relaxed them. Efforts to eliminate non-medical exemptions have faced significant opposition.

Communities with lower healthcare access, communities experiencing poverty, immigrant communities, and communities facing healthcare distrust have often had lower vaccination rates. Some of this reflects healthcare system barriers rather than vaccine hesitancy.

Protection Is Available

Measles is circulating at levels not seen in decades. The country’s elimination status is at genuine risk. But for any individual family, protection is available, affordable, and highly effective.

If you haven’t verified your family’s measles immunity, do it now. Check vaccination records. Get vaccinated if you lack documentation of two doses. Talk with your healthcare provider if you have questions about your individual situation or your family’s risk factors. If there’s an outbreak in your area, prioritize vaccination immediately. If you have young children or are planning pregnancy, ensure you have immunity beforehand.

The goal isn’t to live in fear of measles. It’s to ensure that measles remains, as it has been for 25 years, a disease that doesn’t regularly affect Americans. That requires vaccination rates staying high—above 95 percent for reliable community protection. It requires vigilance about outbreaks. It requires resisting misinformation about vaccine safety. And it requires understanding that vaccination protects not yourself alone, but vulnerable people in your community who depend on you being vaccinated.

Measles elimination was a genuine public health achievement. Losing it would be a real loss.

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