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Updated: Aug 13, 2026

Intracerebroventricular Viral Injection of the Neonatal Mouse Brain for Persistent and Widespread Neuronal Transduction
Published on: September 15, 2014
Herpes simplex encephalitis in infants
Insights
Severe herpes simplex virus type 1 encephalitis in infants can lead to poor outcomes. Early acyclovir treatment did not prevent significant neurological impairment in two infant cases.
Area of Science:
- Pediatric Neurology
- Infectious Diseases
- Virology
Background:
- Herpes simplex virus type 1 (HSV-1) is a common cause of viral encephalitis.
- Infants are particularly vulnerable to severe neurological complications from HSV-1 infections.
Observation:
- Two infants presented with severe encephalitis and focal seizures.
- Diagnosis was confirmed by detecting IgM antibodies to HSV-1 in cerebrospinal fluid and serum.
Findings:
- Primary HSV-1 infection caused severe encephalitis in both infants.
- Despite prompt intravenous acyclovir administration, clinical response was poor.
- Both infants experienced severe, lasting neurological impairment.
Implications:
- This highlights the potential severity of HSV-1 encephalitis in infants.
- Early diagnosis and treatment may not always prevent severe neurological sequelae.
- Further research into optimal management strategies for infant HSV-1 encephalitis is warranted.
Abstract:
Two cases are reported of severe encephalitis in infants that were caused by a primary infection with herpes simplex virus type 1. Both patients presented with focal seizures; the clinical diagnosis was confirmed by the rapid appearance of IgM antibody to herpes simplex virus type 1 in cerebrospinal fluid and serum. In spite of the early use of acyclovir, which was administered by the intravenous route, the clinical response was poor and both infants were left with severe neurological impairment.
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