Measles Outbreaks Linked to Deadly Brain Complication

Doctors warn of rising cases of subacute sclerosing panencephalitis (SSPE), a rare but fatal neurological condition caused by the measles virus.

Mar. 15, 2026 at 9:39pm

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As measles cases surge in the U.S., doctors are sounding the alarm about a deadly brain complication called subacute sclerosing panencephalitis (SSPE) that can develop years after a measles infection, especially in young children. SSPE is almost always fatal, and with vaccination rates dropping, experts fear more cases will emerge. The story profiles several SSPE patients, including an 8-year-old girl in India who is now paralyzed, and highlights the importance of measles vaccination to prevent this rare but devastating condition.

Why it matters

SSPE is a rare but devastating neurological condition that can develop years after a measles infection, especially in young children. As measles outbreaks increase due to declining vaccination rates, doctors warn that more SSPE cases are likely to emerge, underscoring the critical importance of measles vaccination to protect vulnerable populations.

The details

SSPE is caused by the measles virus secretly making its way to the brain, where it can lie dormant for years before causing severe neurological damage. Symptoms include stumbling, jerking, hallucinations, and eventually paralysis and death. Researchers estimate about 1 in 10,000 people who get measles will develop SSPE, with a higher risk for those infected before age 5. Doctors say SSPE cases are likely being missed, and warn the condition is almost always fatal with no effective treatments.

  • In 2025, the CDC recorded over 3,500 measles cases, more than the entire previous decade.
  • In 2026, a 6-year-old in Connecticut and a school-age child in California were diagnosed with SSPE after having measles as infants.

The players

Deepanwita Dasgupta

An 8-year-old girl in Bangalore, India who is now paralyzed and unable to talk after developing SSPE years after a measles infection as an infant.

Yasmin Khakoo

A doctor in New York City with expertise in neurologic conditions who leads the national Child Neurology Society.

Adam Ratner

A member of the American Academy of Pediatrics' Committee on Infectious Diseases and author of the book "Booster Shots".

Aaron Nelson

A professor of neurology at the New York University Grossman School of Medicine who recently diagnosed a 5-year-old child with SSPE.

Nava Yeganeh

The medical director of the Vaccine Preventable Disease Control Program at the Los Angeles County public health department, who had two patients with SSPE.

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What they’re saying

“We don't have a way of knowing who's going to get it, and we don't have a way of very effectively treating it. The one best thing that we can do, ideally, is to prevent children from having to go through it in the first place.”

— Aaron Nelson, Professor of Neurology, New York University Grossman School of Medicine

“This is an example of someone who did everything right, wanted to protect their child against this infection, and unfortunately ended up losing their child because we didn't have herd immunity for them.”

— Nava Yeganeh, Medical Director, Vaccine Preventable Disease Control Program, Los Angeles County Public Health Department

“Imagine that: Having a child who is healthy and happy, moving to talking less and less, eventually not able to walk. It's a very sad thing.”

— Aaron Nelson, Professor of Neurology, New York University Grossman School of Medicine

What’s next

Doctors and public health officials are working to raise awareness about SSPE among clinicians and the public, in hopes of preventing more cases through increased measles vaccination.

The takeaway

This story underscores the critical importance of measles vaccination, not just to prevent the initial illness, but to protect against the devastating long-term neurological complications like SSPE that can develop years later, especially in young children. Preventing measles outbreaks is key to eliminating this rare but fatal condition.