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6. Are there immediate or delayed neurologic complications of H1N1 flu?
To date, no neurologic illnesses or events have been seen in the H1N1 cases. Ongoing surveillance is being conducted to assess these potential complications, however.
In the setting of seasonal influenza, rare cases of influenza-associated encephalopathy (IAE) have been reported, particularly among children. The underlying mechanism of the encephalopathy is not well understood. IAE is characterized by the occurrence of neurologic symptoms within a few days to a week following initial influenza-like illness; fever and altered mental status are common, and seizures are frequently reported. Focal neurologic signs, including paresis, movement disorders, cranial nerve palsies, and aphasia, may develop. CSF is generally unremarkable, with absence of pleocytosis and normal or mildly elevated protein levels.
IAE has been more frequently reported with influenza A, especially with A (H3N2) virus infection, but has been reported with influenza B. We do not know if the H1N1 strain might be associated with similar cases. Acute necrotizing encephalopathy (ANE), a particularly severe manifestation of para-infectious encephalopathy, has been described with seasonal influenza. ANE is characterized by a fulminant and monophasic course; multifocal necrotizing brain lesions predominant in the thalami and brainstem are seen on neuroimaging.
Case reports of other neurologic features, including acute demyelinating inflammatory neuropathy (AIDP), acute disseminated encephalomyelitis (ADEM) and transverse myelitis ™, as well as brachial neuritis have also been reported in the setting of seasonal influenza, although such reports are few.
Whether these neurologic features might be observed in the setting of H1N1 influenza infection is not known.
3.¡ÖInfluenza A virus-associated acute necrotizing encephalopathy in the United States¡×
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6.¡ÖH1N1 Can Cause Neurologic Complications in Children¡×
7.¡ÖInfluenza on the brain¡×
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