Measles and Its Hidden Dangers
Measles is usually unpleasant but manageable for most people. Occasionally, however, it can lead to a severe brain condition that, while rare, can have devastating effects over time.
A recent article in the New England Journal of Medicine detailed a specific case involving a 7-year-old boy who tragically developed and eventually succumbed to a delayed form of encephalitis, or brain swelling, several years after his initial measles infection. Although such cases are quite uncommon, there have been reports of other children experiencing various forms of encephalitis amid the ongoing measles outbreaks in the U.S.
Understanding Measles-Related Encephalitis
Encephalitis related to measles can manifest in a few different ways.
First, there’s primary measles encephalitis, which occurs when the virus directly enters the brain during infection. Then there’s acute post-infectious encephalitis, which happens as a harmful immune response shortly after the infection, typically within a month. Both types occur in roughly one in every 1,000 children who contract measles.
There’s also a third form known as subacute sclerosing panencephalitis (SSPE). This condition arises from a mutated measles virus that stays in the body, gradually damaging the brain. Symptoms often don’t appear until 6 to 8 years later, and unlike the other forms, SSPE is nearly always fatal.
In the reported case, the 7-year-old boy experienced seizures and cognitive decline three months before consulting doctors. By then, he had lost the ability to speak, and an MRI showed significant brain damage. Having contracted measles at 7 months old in Afghanistan, where the virus is common, tests confirmed a high presence of measles antibodies in his spinal fluid, leading to an SSPE diagnosis.
“Twelve months after the initial onset of symptoms, the patient died,” the medical team noted.
A Stark Reminder
SSPE is even rarer, affecting about one in every 25,000 children who get measles. The risk increases for those infected before their first birthday, where the odds become one in 5,550. It may take years before we can tell if recent measles cases in the U.S. lead to SSPE.
Nevertheless, the current outbreaks are already having severe consequences, with over 3,000 cases reported since early 2025. Recently, South Carolina health officials revealed at least 19 hospitalizations for serious measles-related issues, including encephalitis in various children. Since last year, hundreds have been hospitalized, and three individuals, including two children, have died.
The unfortunate reality is that most of these outcomes could have been avoided. Vaccination is highly effective at preventing measles, and even those who do get infected after being vaccinated tend to experience milder symptoms.
“Vaccination is the primary way to prevent measles infection and its neurological consequences,” the authors emphasized.
Thanks to vaccination efforts, measles was declared eliminated in the U.S. back in 2000, with vaccination rates remaining high. Sadly, that status is now at risk. If measles re-establishes itself in America, we could see more tragic cases like this reemerge.
