Herpes simplex encephalitis: adolescents and adults.

Area of Science:

• Neurovirology
• Infectious Diseases
• Neurology

Background:

• Herpes simplex encephalitis (HSE) is a devastating central nervous system infection, particularly affecting children and adolescents.
• Clinical diagnosis can be challenging due to overlapping symptoms with other neurological conditions.
• While neuroimaging and electroencephalography aid diagnosis, polymerase chain reaction (PCR) detection of herpes simplex virus (HSV) DNA in cerebrospinal fluid is the gold standard.

Purpose of the Study:

• To review the current understanding of Herpes simplex encephalitis (HSE) diagnosis, treatment, and outcomes.
• To highlight the limitations of current diagnostic methods and treatments.
• To discuss ongoing research aimed at improving neurological outcomes for HSE patients.

Main Methods:

• Review of clinical presentation, diagnostic tools (MRI, EEG, PCR), and treatment protocols for HSE.
• Discussion of the efficacy and limitations of acyclovir therapy.
• Exploration of emerging research on prognostic markers and extended antiviral treatment.

Main Results:

• PCR for HSV DNA in CSF is the preferred diagnostic method, though early false negatives can occur.
• Acyclovir is the standard treatment, administered for 21 days.
• Despite timely treatment, approximately two-thirds of HSE survivors experience significant long-term neurological deficits.

Conclusions:

• HSE remains a critical neurological emergency requiring prompt diagnosis and intervention.
• Current treatment strategies, while effective, result in substantial morbidity.
• Further research is needed to identify prognostic indicators and optimize antiviral therapy duration for better patient outcomes.