What is Herpes Meningoencephalitis?
Herpes meningoencephalitis is a serious infection that affects both the brain and the thin layers that cover it. It is caused by the herpes simplex virus, most often the same virus that leads to cold sores.
This condition develops quickly and requires immediate medical care. Without prompt treatment, it can lead to severe complications or become life-threatening.
This condition is most often caused by the herpes simplex virus type 1 (HSV-1). In some cases, HSV-2 may be involved, especially in newborns or through sexual transmission.
The virus can remain inactive in the body for years and later reactivate, leading to brain infection. In rare cases, it may occur during a person’s first exposure to the virus.
Symptoms
Herpes meningoencephalitis can start with general symptoms and quickly progress as the brain becomes involved.
Common symptoms include:
- Fever and severe headache
- Stiff neck
- Sensitivity to light
- Confusion or trouble thinking clearly
- Seizures
- Changes in mood or behavior
- Hallucinations
- Extreme drowsiness or loss of consciousness
How is it diagnosed?
Healthcare providers begin with a detailed review of symptoms and a neurological exam to check brain function.
To confirm the diagnosis, tests may include:
- A lumbar puncture (spinal tap) to examine fluid around the brain
- MRI or CT scans to look for inflammation
- EEG to measure brain activity
- Blood tests to identify infection
These tests help providers quickly determine the cause and begin treatment.
How is it treated?
Treatment starts right away, often before all test results are confirmed. Early care is critical.
The main treatment includes:
- Intravenous antiviral medication (acyclovir) to fight the virus
- Medications to reduce brain swelling
- Anti-seizure medications, if needed
Most patients are cared for in the hospital during treatment.
With early treatment, many people begin improving within a few days. Recovery may take several weeks. Some individuals, especially those with severe illness, may experience lasting effects such as memory problems or seizures.
