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As this year’s severe flu season continues to spread across the United States, federal health officials are investigating a troubling rise in rare but potentially life-threatening brain complications in children.
The U.S. Centers for Disease Control and Prevention (CDC) reports that at least 19,000 people have succumbed to the flu this winter, including 86 children. According to new data published in the CDC’s Morbidity and Mortality Weekly Report (MMWR) on February 27, nine of these pediatric deaths were linked to serious brain complications triggered by the virus.
Understanding Influenza-Associated Encephalopathy
The condition, known as influenza-associated encephalopathy or encephalitis (IAE), is a rare but severe form of brain inflammation caused by the flu. In extreme cases, children can develop acute necrotizing encephalopathy (ANE), a particularly dangerous form of brain damage linked to viral infections.
While IAE is uncommon, the CDC’s preliminary data for the 2024–25 flu season indicate that 13% of child flu deaths involved these brain complications. Historically, among the 1,840 pediatric flu deaths reported since 2010, 166 children (9%) had suffered from IAE. The proportion has varied in previous flu seasons, ranging from 4% in 2013–14 to a peak of 14% in 2011–12. During the 2020–21 flu season, when flu cases hit a historic low due to COVID-19 precautions, there were no reported cases of IAE-related deaths.
Challenges in Tracking Cases
A major challenge for public health officials is the lack of a standardized tracking system for IAE and ANE in the U.S. This gap makes it difficult to determine whether this year’s cases are unusually high compared to previous flu seasons. In response, the CDC has urged state health departments to report any additional cases and has encouraged hospitals to test for flu in children presenting with severe neurological symptoms.
Severe Cases and Vaccine Data
Among the nine children with flu-linked brain complications this season, four had the most severe form, ANE. All were under the age of five.
Of these four children, two had received a flu vaccination, while the other two had not. All four required mechanical ventilation, and two experienced seizures during hospitalization.
Medical experts emphasize the importance of recognizing early warning signs such as seizures, confusion, and hallucinations in flu-infected children. According to the MMWR report, “Progression to severe neurologic impairment and death from IAE can occur rapidly after onset of influenza symptoms. Prompt recognition and intervention are crucial.”
Importance of Vaccination
Despite the severity of this flu season, only about 45% of Americans have received their flu shots. Experts stress that while the flu vaccine may not always prevent infection, it significantly reduces the risk of severe illness, hospitalization, and death.
“The main role of the flu vaccine is to keep you out of the hospital and to keep you alive,” explained Dr. William Schaffner, a vaccine expert at Vanderbilt University. Preliminary CDC data indicate that flu vaccination reduced the risk of hospitalization by 64% to 78% in children and 41% to 55% in adults.
“If you haven’t gotten your flu shot yet, get it because we’re still seeing high flu circulation in most of the country,” urged Dr. Sean O’Leary of the American Academy of Pediatrics.
Concerns Over Next Season’s Flu Vaccine
The growing concern over flu-related complications comes at a time of uncertainty regarding next year’s flu vaccine. The Trump administration recently canceled a March 13 meeting where experts were set to discuss which flu strains to include in next season’s shot. Public health officials stress the importance of transparency in these discussions to ensure the best possible protection against future flu outbreaks.
Disclaimer: This article is based on preliminary data and ongoing research. Information regarding flu-related complications and vaccinations may evolve as new studies emerge. Readers are encouraged to consult healthcare professionals and official health agencies for the latest recommendations on flu prevention and treatment.
