Respiratory viruses linked to pediatric acute necrotizing encephalopathy in meta-analysisUnderstanding the link between respiratory viruses and brain inflammation in children

Frontiers in Medicine Published October 16, 2026 DOI ↗ Editorial oversight: Dr. Ji-eun Park, MD · Brain, Mind & Pain

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Key Takeaway

Interpret ANE evidence cautiously; meta-analysis lacks pooled data.

This meta-analysis synthesizes evidence on the association between respiratory viral infections, specifically influenza viruses and SARS-CoV-2, and acute necrotizing encephalopathy (ANE) in pediatric patients. The scope includes clinical phenotype, neuroimaging features, treatment strategies, and outcomes.

The authors note that the evidence base is fragmented because ANE is a rare disease. The abstract is cut off and does not provide specific meta-analysis results, pooled effect sizes, or data points. No information is available on sample size, follow-up duration, or comparator groups.

Safety data, including adverse events, serious adverse events, discontinuations, and tolerability, are not reported. Funding sources and conflicts of interest are also not reported.

Given the lack of quantitative findings and the rarity of the condition, the clinical implications remain uncertain. The meta-analysis highlights the need for more comprehensive evidence but does not provide actionable guidance for practice at this time.

How this fits prior evidence

This meta-analysis addresses a gap not covered in prior items, which focused on influenza vaccination strategies and outcomes. Prior coverage reported that early LAIV administration was associated with 2.5-times increased odds of pneumococcal density at 14 days, that influenza vaccination among Chinese health care workers was pooled at 27%, that recombinant influenza vaccine yielded higher A(H1N1) and A(H3N2) titers in adults with severe obesity, and that an opt-out nudge reduced unvaccinated medical residents by 81%. Those items examined prevention or immunogenicity, whereas this synthesis examines a rare neurologic complication of respiratory viral infections in children. No prior item addressed ANE or pediatric neuroimaging outcomes.

Doctors are looking closely at a rare but serious condition called acute necrotizing encephalopathy. This condition involves severe brain swelling and damage. It can happen in children following certain infections.

Recent reviews focus on how respiratory viruses, such as the flu and COVID-19, might trigger this brain inflammation. Because these viruses are common, understanding their link to brain health is very important for pediatric care.

Because this brain condition is so rare, it can be hard for doctors to find enough cases to study. This makes it difficult to create a single clear rule for treatment. However, gathering more information helps doctors recognize early warning signs.

Doctors continue to study how these infections affect the brain. By looking at many cases at once, they hope to find better ways to protect children and manage symptoms more effectively when these infections occur.

What this means for you:

Doctors are studying how flu and COVID-19 may cause severe brain swelling in children to improve care.

Common questions

What is acute necrotizing encephalopathy?

It is a rare and serious condition where brain tissue is damaged. It can be triggered by various factors, including respiratory viral infections like the flu or COVID-19. Because it is so rare, the clinical evidence and specific data points are currently fragmented.

Can flu or COVID-19 cause brain issues in children?

Research is looking into whether these specific respiratory viruses can trigger acute necrotizing encephalopathy in pediatric patients. While the link is being studied, the rarity of the disease means that the full extent of the risk is not yet fully clear.

Study Details

Study typeMeta analysis

EvidenceLevel 1

PublishedOct 2026

View Original Abstract ↓

BackgroundAcute necrotizing encephalopathy is a rare but severe pediatric neurological disorder characterized by rapid neurological deterioration and characteristic bilateral thalamic lesions on neuroimaging. Increasing evidence suggests that respiratory viral infections, particularly influenza viruses and SARS-CoV-2, play a major role in triggering ANE. However, clinical evidence remains fragmented due to the rarity of the disease. This study aimed to systematically synthesize current evidence on respiratory viral triggers, clinical presentation, neuroimaging features, treatment strategies, and outcomes of pediatric ANE.MethodsA systematic review and meta-analysis were conducted following PRISMA 2020 guidelines. Electronic databases including PubMed/MEDLINE, Scopus, Web of Science, and Embase were searched for studies published between January 1, 2015, and March 31, 2026 involving pediatric patients (

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Common questions

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