measles

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CDC data confirms US is 2 months away from losing measles elimination status

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Unsurprising

This 9171 subtype “continues, unfortunately uninterrupted, across multiple jurisdictions,” David Sugerman, who leads the CDC measles response, said on the call.

According to the Times, local health officials are pessimistic that they’ll be able to stamp out the virus’s spread, saying that vaccination efforts have had “limited” impact. As Ars reported previously, vaccination rates are dangerously low in two measles hotspots: northwestern Mohave County, Arizona, and the southwest health district of Utah. Vaccination rates among kindergartners in the 2024–2025 school year were 78.4 percent and 80.7 percent, respectively. That’s well below the 95 percent target needed to keep the virus from spreading onward in the communities.

In addition, public health officials in Arizona and Utah have reported barriers to responding to the outbreak. Around a quarter of cases don’t know how they were exposed, suggesting cases and exposures are being missed. In late October, health officials in Salt Lake County, Utah, said that a person likely infected with measles refused to cooperate with their investigation, leaving them unable to confirm the probable case.

David Kimberlin, who sits on a panel of experts that analyzes measles data for the United States’ elimination status review, told the Times, “It would not surprise me in the least if there’s continued spread across these next several months.”

To date, the CDC has tallied 1,723 measles cases across 42 states. Most (87 percent) of those cases were linked to outbreaks, of which there have been 45 this year. For context, there were 16 outbreaks and a total of 285 measles cases in the US last year. This year’s measles cases mark a 33-year high.

CDC data confirms US is 2 months away from losing measles elimination status Read More »

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Canada fought measles and measles won; virus now endemic after 1998 elimination

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“This loss represents a setback, of course, but it is also reversible,” Jarbas Barbosa, director of PAHO, said in a press briefing Monday.

Call to action

Barbosa was optimistic that Canada could regain its elimination status. He highlighted that such setbacks have happened before. “In 2018 and 2019, Venezuela and Brazil temporarily lost their elimination status following large outbreaks,” Barbosa noted. “Thanks to coordinated action by governments, civil society, and regional cooperation, those outbreaks were contained, and the Region of the Americas regained its measles-free status in 2024.”

On Monday, the Public Health Agency of Canada released a statement confirming that it received notification from PAHO that it had lost its measles elimination status, while reporting that it is already getting to work on earning it back. “PHAC is collaborating with the PAHO and working with federal, provincial, territorial, and community partners to implement coordinated actions—focused on improving vaccination coverage, strengthening data sharing, enabling better overall surveillance efforts, and providing evidence-based guidance,” the agency said.

However, Canada isn’t the only country facing an uphill battle against measles—the most infectious virus known to humankind. Outbreaks and sustained spread are also active in the US and Mexico. To date, the US has documented at least 1,618 measles cases since the start of the year, while Mexico has tallied at least 5,185. Bolivia, Brazil, Paraguay, and Belize also have ongoing outbreaks, PAHO reported.

As of November 7, PAHO has collected reports of 12,593 confirmed measles cases from 10 countries, but approximately 95 percent of them are in Canada, Mexico, and the US. That total is a 30-fold increase compared to 2024, PAHO notes, and the rise has led to at least 28 deaths: 23 in Mexico, three in the United States, and two in Canada.

The PAHO used Canada’s loss as a call to action not just in the northern country, but the rest of the region. “Every case we prevent, every outbreak we stop saves lives, protects families, and makes communities healthier,” Barbosa said. “Today, rather than lamenting the loss of a regional status, we call on all countries to redouble their efforts to strengthen vaccination rates, surveillance, and timely response to suspected cases—reaching every corner of the Americas. As a Region, we have eliminated measles twice. We can do it a third time.”

Canada fought measles and measles won; virus now endemic after 1998 elimination Read More »

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Measles outbreak investigation in Utah blocked by patient who refuses to talk

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A measles investigation amid a large, ongoing outbreak at the Arizona-Utah border has hit a roadblock as the first probable case identified in the Salt Lake City area refuses to work with health officials, the local health department reported this week.

There have been over 150 cases collectively across the two states, mostly in northwestern Mohave County, Arizona, and the southwest health district of Utah, in the past two months. Both areas have abysmally low vaccination rates: In Mohave County, only 78.4 percent of kindergartners in the 2024–2025 school year were vaccinated against measles, according to state records. In the southwest district of Utah, only 80.7 percent of kindergartners in the 2024–2025 school year had records of measles vaccination. Public health experts say vaccination coverage of 95 percent is necessary to keep the disease from spreading in a community.

While the outbreak has largely exploded along the border, cases are also creeping to the north, toward Salt Lake County, which encompasses the city. Utah County, which sits just south of Salt Lake County, has identified eight cases, including a new case reported today.

Uncooperative case

Salt Lake County likely has a new one, too—the first for the county this year—as well as possible exposures. But, they can’t confirm it.

County health officials said that a health care provider in the area contacted them late on Monday to tell them about a patient who very likely has measles. The officials then spent a day reaching out to the person, who refused to answer questions or cooperate in any way. That included refusing to share location information so that other people could be notified that they were potentially exposed to one of the most infectious viruses known.

“The patient has declined to be tested, or to fully participate in our disease investigation, so we will not be able to technically confirm the illness or properly do contact tracing to warn anyone with whom the patient may have had contact,” Dorothy Adams, executive director of Salt Lake County Health Department, said in a statement. “But based on the specific symptoms reported by the healthcare provider and the limited conversation our investigators have had with the patient, this is very likely a case of measles in someone living in Salt Lake County.”

Measles outbreak investigation in Utah blocked by patient who refuses to talk Read More »

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Measles outbreak in SC sends 150 unvaccinated kids into 21-day quarantine

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Health officials in South Carolina are warning that the highly infectious measles virus is spreading undetected in communities in the northern part of the state, specifically Spartanburg and Greenville counties.

Last week, officials in Greenville identified an eighth measles case that is potentially linked to the outbreak. Seven outbreak cases had been confirmed since September 25 in neighboring Spartanburg, where transmission was identified in two schools: Fairforest Elementary and Global Academy, a public charter school.

Across those two schools, at least 153 unvaccinated children were exposed to the virus and have been put in a 21-day quarantine, during which they are barred from attending school, state officials said in a press conference. Twenty-one days is the maximum incubation period, spanning from when a person is exposed to when they would develop a rash if infected.

It’s unclear how the latest case in Greenville became infected with the virus and how they may link to the nearby Spartanburg cases.

“What this case tells us is that there is active, unrecognized community transmission of measles occurring in the Upstate [northern region of South Carolina], which makes it vital to ensure that the public have received their measles vaccinations,” the South Carolina Department of Public Health said in an announcement.

The two recommended doses of the measles, mumps, and rubella (MMR) vaccine are about 97 percent effective at blocking the infection, and that protection is considered lifelong. Without that protection, the virus is extremely contagious, infecting 90 percent of unvaccinated people who are exposed. The virus spreads easily through the air, lingering in the airspace of a room for up to two hours after an infected person has left.

Measles outbreak in SC sends 150 unvaccinated kids into 21-day quarantine Read More »

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RFK Jr. adds more anti-vaccine members to CDC vaccine advisory panel

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Kirk Milhoan, a pediatric cardiologist who is a senior fellow at the Independent Medical Alliance (formerly Front Line COVID-19 Critical Care Alliance), which promotes misinformation about COVID-19 vaccines and touts unproven and dubious COVID-19 treatments. Those include the malaria drug hydroxychloroquine, the de-worming drug ivermectin, and various concoctions of vitamins and other drugs. Milhoan has stated that mRNA COVID-19 vaccines should be removed from the market, telling KFF in March: “We should stop it and test it more before we move forward.”

Evelyn Griffin, an obstetrician and gynecologist in Louisiana who reportedly lost her job for refusing to get a COVID-19 vaccine. In a speech at a Louisiana Health Freedom Day in May 2024, Griffin claimed that doctors “blindly believed” that mRNA COVID-19 vaccines were safe. She has also claimed that the vaccines cause “bizarre and rare conditions,” according to the Post.

Hillary Blackburn, a pharmacist in St. Louis. Reuters reports that she is the daughter-in-law of Sen. Marsha Blackburn (R-Tenn.), who has opposed vaccine mandates.

Raymond Pollak, a semi-retired transplant surgeon who filed a whistleblower lawsuit against the University of Illinois Hospital in 1999, alleging the hospital manipulated patient data to increase their chances of receiving livers. The hospital settled the suit, paying $2.5 million, while denying wrongdoing.

ACIP is scheduled to meet at the end of this week, on September 18 and September 19. According to an agenda recently posted online, the committee will vote on recommendations for a measles, mumps, rubella, and varicella (MMRV) combination vaccine, the Hepatitis B vaccine, and this year’s updated COVID-19 vaccines. Vaccine experts widely fear that the committee will rescind recommendations and restrict access to those vaccines. Such moves will likely create new, potentially insurmountable barriers for people, including children, to get vaccines.

ACIP-recommended vaccines are required to be covered by private health insurance plans and the Vaccines for Children program for Medicaid-eligible and under- or uninsured kids, which covers about half of American children. Without ACIP recommendations for a vaccine, insurance coverage would be an open question, and vulnerable children would simply lose access entirely.

RFK Jr. adds more anti-vaccine members to CDC vaccine advisory panel Read More »

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Child dies of horrifying measles complication in Los Angeles

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A child in Los Angeles has died of a measles-related brain disorder stemming from an infection in infancy, the Los Angeles County health department reported Thursday.

Specifically, the child died of subacute sclerosing panencephalitis (SSPE), a rare but always fatal complication that strikes years after an initial measles infection. The health department’s announcement offered few details about the child, including the child’s age, but said that the child had contracted the virus before they were old enough to be vaccinated against measles. The first of two recommended doses of measles, mumps, and rubella (MMR) vaccine is given between 12 and 15 months.

“This case is a painful reminder of how dangerous measles can be, especially for our most vulnerable community members,” Muntu Davis, a Los Angeles County health officer, said in a statement. “Infants too young to be vaccinated rely on all of us to help protect them through community immunity. Vaccination is not just about protecting yourself—it’s about protecting your family, your neighbors, and especially children who are too young to be vaccinated.”

SSPE is caused by a persistent measles infection in the central nervous system. Children infected with the virus may go through the standard disease progression—flu-like symptoms, high fever, the telltale rash—and then appear to fully recover. But, for a small few, the virus remains, and SSPE emerges years later, often seven to 10 years after the initial infection.

The Los Angeles health department noted that SSPE generally affects about 1 in 10,000 people with measles, but the risk may be much higher—about 1 in 600—for those who get measles as infants, such as the child who recently died.

With widespread vaccination, which led to measles being declared eliminated from the US in 2000, SSPE has virtually disappeared in the US. However, with vaccination rates slipping and anti-vaccine misinformation and views gripping the country, health experts fear seeing more of these devastating cases. Already, the US measles case count for the year is at a 33-year high, and two other children, as well as an adult, died from the acute infection this year.

Child dies of horrifying measles complication in Los Angeles Read More »

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The West Texas measles outbreak has ended

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A large measles outbreak in Texas that has affected 762 people has now ended, according to an announcement Monday by the Texas Department of State Health Services. The agency says it has been more than 42 days since a new case was reported in any of the counties that previously showed evidence of ongoing transmission.

The outbreak has contributed to the worst year for measles cases in the United States in more than 30 years. As of August 5, the most recent update from the Centers for Disease Control and Prevention, a total of 1,356 confirmed measles cases have been reported across the country this year. For comparison, there were just 285 measles cases in 2024.

The Texas outbreak began in January in a rural Mennonite community with low vaccination rates. More than two-thirds of the state’s reported cases were in children, and two children in Texas died of the virus. Both were unvaccinated and had no known underlying conditions. Over the course of the outbreak, a total of 99 people were hospitalized, representing 13 percent of cases.

Measles is a highly contagious respiratory illness that can temporarily weaken the immune system, leaving individuals vulnerable to secondary infections such as pneumonia. In rare cases, it can also lead to swelling of the brain and long-term neurological damage. It can also cause pregnancy complications, such as premature birth and babies with low birth weight. The best way to prevent the disease is the measles, mumps, and rubella (MMR) vaccine. One dose of the vaccine is 93 percent effective against measles while two doses is 97 percent effective.

The West Texas measles outbreak has ended Read More »

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Under RFK Jr, CDC skips study on vaccination rates, quietly posts data on drop

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Vaccination rates among the country’s kindergartners have fallen once again, with coverage of the measles, mumps, and rubella (MMR) vaccination dropping from 92.7 percent in the 2023–2024 school year to 92.5 percent in 2024–2025. The percentage changes are small across the board, but they represent thousands of children and an ongoing downward trend that makes the country more vulnerable to outbreaks.

In the latest school year, an estimated 286,000 young children were not fully protected against measles. At the same time, the country has seen numerous explosive measles outbreaks, with case counts in 2025 already higher than any other year since the highly infectious disease was declared eliminated in 2000. In fact, the case count is at a 33-year high.

The latest small decline is one in a series that is eroding the nation’s ability to keep bygone infectious diseases at bay. In the 2019–2020 school year, 95 percent of kindergartners were protected against measles and other serious childhood diseases, such as polio. That 95 percent coverage is the target that health experts say prevents an infectious disease from spreading in a community. But amid the pandemic, vaccination rates fell, dropping to 93.9 percent MMR coverage in the 2020–2021 year, and have kept creeping downward.

Anti-vaccine era

At the height of the pandemic, some slippage in immunization coverage could be blamed on disrupted access. But anti-vaccine sentiments and misinformation are clearly playing a large role as vaccination continues to decline and access has largely resumed. For the 2024–2025 school year, nonmedical exemptions for childhood vaccinations once again hit a new high. These are exemptions driven by ideology and have risen with the influence of anti-vaccine voices, including current health secretary and fervent anti-vaccine advocate Robert F. Kennedy Jr.

Under RFK Jr, CDC skips study on vaccination rates, quietly posts data on drop Read More »

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All childhood vaccines in question after first meeting of RFK Jr.’s vaccine panel

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A federal vaccine panel entirely hand-selected by health secretary and anti-vaccine activist Robert F. Kennedy Jr. gathered for its first meeting Wednesday—and immediately announced that it would re-evaluate the entire childhood vaccination schedule, as well as the one for adults.

The meeting overall was packed with anti-vaccine talking points and arguments from the new panel members, confirming public health experts’ fears that the once-revered panel is now critically corrupted and that Kennedy’s controversial picks will only work to fulfill his long-standing anti-vaccine agenda.

Controversial committee

An hour before the meeting began, the American Academy of Pediatrics came out swinging against the new panel, saying that the panel’s work is “no longer a credible process.” The organization shunned the meeting, refusing to send a liaison to the panel’s meeting, which it has done for decades.

“We won’t lend our name or our expertise to a system that is being politicized at the expense of children’s health,” AAP President Susan Kressly said in a video posted on social media.

The panel in question, the Advisory Committee on Immunization Practices (ACIP), has for more than 60 years provided rigorous public scientific review, discussion, and trusted recommendations to the Centers for Disease Control and Prevention on how vaccines should be used in the US after they’ve earned approval from the Food and Drug Administration. The CDC typically adopts ACIP’s recommendations, and once that happens, insurance providers are required to cover the cost of the recommended shots.

The system is highly regarded globally. But, on June 9, Kennedy unilaterally and summarily fired all 17 esteemed ACIP members and, two days later, replaced them with eight new people. Some have clear anti-vaccine views, others have controversial and contrarian public health views, and several have little to no expertise in the fields relevant to vaccines.

Last night, it came to light that one of the eight new appointees—Michael Ross, an obstetrics and gynecology physician—had withdrawn from the committee during a financial holdings review that ACIP members are required to complete before beginning work on the panel.

All childhood vaccines in question after first meeting of RFK Jr.’s vaccine panel Read More »

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CDC’s once-revered vaccine panel now a “farce”—calls grow to scrap meeting

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“The meeting should be delayed until the panel is fully staffed with more robust and balanced representation—as required by law—including those with more direct relevant expertise,” Cassidy wrote.

“Corrupted”

Vaccine and infectious disease expert Peter Hotez, a dean at Baylor College of Medicine, responded to Cassidy, adding, “Honestly in its current form, the ACIP is mostly devoid of any meaningful expertise in vaccines or infectious diseases. It is organized to pursue a pseudoscience agenda. It’s a waste of taxpayer dollars and should be dissolved. Perhaps down the line it could be resurrected.”

One of the CDC’s leading vaccine experts, Fiona Havers—who recently resigned from the agency in protest—went further to say the CDC’s vaccine processes have been “corrupted in a way that I haven’t seen before.”

“If it isn’t stopped, and some of this isn’t reversed, like, immediately, a lot of Americans are going to die as a result of vaccine-preventable diseases,” she told The New York Times.

Meanwhile, Kennedy’s anti-vaccine agenda appears to be moving forward undeterred. On Tuesday, the CDC released the final agenda for tomorrow‘s ACIP meeting. Kennedy had already altered the agenda to add discussions of two long-standing vaccines: certain flu vaccines that use the mercury-based preservative thimerosal and certain measles vaccines. There is no controversy over these vaccines among experts, but they have long been the target of misinformation and fearmongering by anti-vaccine advocates, including Kennedy.

According to the final ACIP agenda, the meeting will also now include a presentation and recommendations on flu vaccines from Lyn Redwood. She is a nurse with no expertise in vaccinations, infectious diseases, or any other relevant field for the ACIP. Rather, she was the president of Kennedy’s rabid anti-vaccine organization Children’s Health Defense and promotes the debunked falsehood that thimerosal-containing vaccines cause autism.

CDC’s once-revered vaccine panel now a “farce”—calls grow to scrap meeting Read More »

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After RFK Jr. overhauls CDC panel, measles and flu vaccines are up for debate

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With ardent anti-vaccine activist Robert F. Kennedy Jr. in the country’s top health position, use of a long-approved vaccine against measles, mumps, rubella, and varicella/chickenpox (MMRV) as well as flu shots that include the preservative thimerosal will now be reevaluated, putting their future availability and use in question. The development seemingly continues to vindicate health experts’ worst fears that, as health secretary, Kennedy would attack and dismantle the federal government’s scientifically rigorous, evidence-based vaccine recommendations.

Discussions of the two types of vaccines now appear on the agenda of a meeting for the Centers for Disease Control and Prevention’s Advisory Committee for Immunization Practices (ACIP) scheduled for two days next week (June 25 and 26).

ACIP’s overhaul

On June 9, Kennedy summarily fired all 17 members of ACIP, who were rigorously vetted—esteemed scientists and clinicians in the fields of immunology, epidemiology, pediatrics, obstetrics, internal and family medicine, geriatrics, infectious diseases, and public health. Two days later, Kennedy installed eight new members, many with dubious qualifications and several known to hold anti-vaccine views.

Before ACIP was upended by Kennedy, the committee planned to meet for three days, from June 25 to 27, to discuss a wide array of vaccines, including those against anthrax, chikungunya, COVID-19, cytomegalovirus (CMV), Human papillomavirus (HPV), influenza, Lyme disease, meningococcal disease, pneumococcal disease, and respiratory syncytial virus (RSV). The committee was going to vote on recommendations for the use of COVID-19 vaccines, the HPV vaccine, influenza vaccines, the meningococcal vaccine, RSV vaccines for adults, and the RSV vaccine for maternal and pediatric populations.

In the new agenda, discussion on vaccines against CMV, HPV, Lyme disease, meningococcal disease, and pneumococcal disease has been dropped. So have votes for COVID-19 vaccines, HPV, meningococcal vaccines, and RSV vaccines for adults. Instead, the new ACIP will now discuss MMRV and influenza vaccines containing thimerosal. It will only vote on two matters: RSV vaccines for children and pregnant people, and influenza vaccines, including thimerosal-containing flu vaccines.

After RFK Jr. overhauls CDC panel, measles and flu vaccines are up for debate Read More »

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With over 900 US measles cases so far this year, things are looking bleak

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As of Friday, April 25, the US has confirmed over 900 measles cases since the start of the year. The cases are across 29 states, but most are in or near Texas, where a massive outbreak continues to mushroom in close-knit, undervaccinated communities.

On April 24, the Centers for Disease Control and Prevention had tallied 884 cases across the country. Today, the Texas health department updated its outbreak total, adding 22 cases to its last count from Tuesday. That brings the national total to at least 906 confirmed cases. Most of the cases are in unvaccinated children and teens.

Overall, Texas has identified 664 cases since late January. Of those, 64 patients have been hospitalized, and two unvaccinated school-aged children with no underlying medical conditions have died of the disease. An unvaccinated adult in New Mexico also died from the infection, bringing this year’s measles death toll to three.

The cases and deaths are breaking records. In the past 30 years, the only year with more measles cases than the current tally was 2019, which saw 1,274 cases. Most of those cases were linked to large, extended outbreaks in New York City that took 11 months to quell. The US was just weeks away from losing its elimination status, an achievement earned in 2000 when the country first went 12 months without continuous transmission.

Since 2019, vaccination coverage of the measles, mumps, and rubella (MMR) vaccine among US kindergartners has only fallen. National rates fell from 95 percent in 2019—the threshold considered necessary to keep measles from spreading—to 92.7 percent in the 2023–24 school year, the most recent year for which there’s data.

On the brink

In 2019, amid the record annual case tally, cases had only reached a total of 704 by April 26. With this year’s tally already over 900, the country is on track to record a new high. Before 2019, the next highest case total for measles was in 1994. That year, the country saw 899 cases, which 2025 has already surpassed.

With over 900 US measles cases so far this year, things are looking bleak Read More »