Chickenpox Virus Found in the Brain: A Rare Neurological Case Explained

Most people think of chickenpox as a mild childhood illness — uncomfortable, itchy, but ultimately harmless. What is less known is that the varicella-zoster virus (VZV) never truly leaves the body. After primary chickenpox, the virus retreats to nerve cell bodies in the dorsal root ganglia and cranial nerve ganglia — and lies dormant, potentially for decades.

Shingles — The First Reactivation

When immunity weakens — due to ageing, illness, stress, or immunosuppressive medication — VZV can reactivate and travel down nerve fibres, causing the characteristic painful rash of shingles (herpes zoster) in a dermatomal distribution. Most people know this. What is less appreciated is that reactivation does not always cause the typical rash — sometimes the virus reactivates silently and causes neurological complications without a visible skin lesion.

VZV Vasculitis — Stroke from Chickenpox Virus

One of the most serious neurological complications is VZV vasculitis — where the virus infects and inflames the walls of cerebral blood vessels, leading to narrowing, thrombosis, or haemorrhage. The result can be stroke — sometimes months after a rash, sometimes without any rash at all. This is a rare but real cause of stroke, particularly in immunocompromised patients.

VZV Encephalitis

VZV can directly infect brain tissue, causing encephalitis — presenting with fever, confusion, seizures, and altered consciousness. MRI shows characteristic temporal lobe involvement. Treatment: high-dose intravenous acyclovir (antiviral medication) started as soon as possible.

Prevention: The Varicella Vaccine

The chickenpox vaccine (varicella vaccine) prevents primary infection and significantly reduces the risk of shingles and its neurological complications. The shingles vaccine (Shingrix) is recommended for adults over 50 in countries where it is available. In Hyderabad, varicella vaccination is recommended for all children not previously infected.

For neurological complications of viral infections: Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.