As flu season returns to the United States, health experts are warning parents about a rare but life-threatening complication that can strike even healthy children. The illness, called acute necrotizing encephalopathy (ANE), causes severe brain swelling and has been linked to fatal outcomes in nearly one out of four cases.
While flu is generally mild and treatable at home, doctors say parents must stay alert this season after recent medical reviews revealed dozens of children across the US developed ANE during flu outbreaks.
🧠 What Is Acute Necrotizing Encephalopathy?
ANE is an extremely rare neurological complication that occurs when the body’s immune system overreacts to a viral infection, most commonly the flu. This overreaction damages the blood-brain barrier, leading to:
- Dangerous brain inflammation
- Tissue damage
- Rapid swelling that can turn fatal if untreated
“It’s rare, but when it strikes, it can progress very quickly,” explained Dr. Nicholas Dragolea. “Outcomes can be devastating if it’s not caught in time.”
🚨 Warning Signs Parents Should Watch For
Doctors emphasize that ANE can develop suddenly during what seems like a normal flu infection. Red flags include:
- Fainting or sudden loss of consciousness
- Seizures
- Difficulty breathing
- Trouble walking, moving, or speaking
“Most kids recover from flu with rest and fluids,” Dr. Dragolea noted. “But if your child shows neurological symptoms, don’t wait — seek emergency medical care immediately.”
👶 Who Is Most at Risk?
A study published in JAMA reviewed 41 cases of ANE in children during recent flu seasons. Findings revealed:
- 75% were healthy children with no prior medical conditions
- Most were around five years old
- 27% (11 children) died from the illness
- Survivors required hospital stays lasting up to three weeks
The CDC also reported that last year, among 68 US children who died of flu, nine had encephalopathy, including four with the acute necrotizing form.
📊 How Rare Is ANE?
While the condition is alarming, experts stress that ANE remains very rare. Millions of children get the flu each year, but only a tiny fraction develop this complication.
Still, doctors say the severe outcomes — and the fact that it can affect otherwise healthy kids — make awareness critical.
💉 Vaccination: The Strongest Defense
Research shows the flu vaccine significantly reduces the risk of severe illness. However, only 16% of children with ANE had been vaccinated.
The CDC recommends annual flu shots for all children aged six months and older. “Vaccination doesn’t eliminate the risk, but it makes dangerous outcomes far less likely,” said Dr. Fatimah Dawood of the CDC.
🦠 Could the Pandemic Play a Role?
Doctors believe that reduced exposure to everyday microbes during COVID-19 lockdowns may have impacted children’s immune responses. This could partly explain the recent rise in severe flu complications.
“The immune system develops through exposure,” Dr. Dragolea said. “Pandemic disruptions may have changed how some children respond to infections.”
✅ Bottom Line for Parents
Flu is usually mild and manageable, but doctors stress that parents should not dismiss unusual symptoms.
- Get children vaccinated against flu
- Monitor symptoms carefully during flu season
- Seek immediate care if neurological signs (like seizures or confusion) appear
“These cases are rare, but devastating when they happen,” Dr. Dragolea warned. “Awareness, preparedness, and vaccination are the best tools to protect children.”
