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  • Title: Influenza B virus encephalitis.
    Author: McCullers JA, Facchini S, Chesney PJ, Webster RG.
    Journal: Clin Infect Dis; 1999 Apr; 28(4):898-900. PubMed ID: 10825057.
    Abstract:
    Acute encephalitis and postinfectious encephalopathy have been reported infrequently in association with influenza A and B virus infections. We report herein a case of a 6-year-old girl with acute influenza B virus encephalitis resulting in neurological sequelae. The diagnosis was made by isolation of influenza B virus from the nasopharynx, seroconversion to influenza B, and reverse transcription polymerase chain reaction (RT-PCR) identification of the virus from the patient's cerebrospinal fluid. Direct sequencing of viral RNA from the patient's nasopharynx and cerebrospinal fluid revealed identical nucleotide sequences in the HA1 region of the hemagglutinin gene. This is the first report of influenza B virus encephalitis diagnosed by use of RT-PCR and illustrates the need for increased awareness of influenza virus as a cause of acute encephalitis. PCR may be a useful tool for diagnosing future cases.
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