Viral meningitis is the most common form of meningitis and, unlike bacterial meningitis, is rarely life-threatening. Dr. Anand Karnam explains the causes, the lumbar puncture findings that distinguish it, and the treatment approach.
Key Points
- Viral meningitis is usually caused by enteroviruses — self-limiting and rarely life-threatening.
- Symptoms mirror bacterial meningitis: fever, headache, neck stiffness, photophobia — but usually less severe.
- Lumbar puncture distinguishes viral (clear CSF, lymphocytes, normal glucose) from bacterial (turbid CSF, neutrophils, low glucose).
- No specific antiviral treatment for most viral meningitis — supportive care with analgesia and hydration.
- Herpes simplex meningitis/encephalitis is the exception — requires urgent IV acyclovir.
85%
of viral meningitis cases are caused by enteroviruses
Source: NCBI
7–10 days
typical recovery time for enteroviral meningitis
Source: NHS
30%
mortality rate for untreated herpes simplex encephalitis — acyclovir is essential
Source: NCBI
"Viral meningitis is genuinely frightening for patients — but for most enteroviral cases, I tell families honestly: we will manage the symptoms, it will run its course in 7–10 days, and virtually all patients recover completely. The diagnosis that cannot be missed is herpes encephalitis."
Meningitis — inflammation of the meninges (the membranes covering the brain and spinal cord) — is classified by aetiology into viral, bacterial, fungal, and tubercular. Viral meningitis (also called aseptic meningitis) is the most common form, accounting for the majority of meningitis cases in immunocompetent people. Unlike bacterial meningitis, which has a mortality of 15–25% even with treatment, viral meningitis is generally self-limiting and benign — most patients recover completely within 7–14 days without specific treatment.
Causes and Epidemiology
Enteroviruses (Coxsackievirus, Echovirus, Enterovirus 71) cause approximately 80–85% of viral meningitis — most cases occur in summer and autumn when enteroviruses circulate. Other causes: herpes simplex virus (HSV-2 most commonly — genital herpes primary infection or reactivation; unlike HSV-1 encephalitis, HSV-2 meningitis is benign); mumps (rare with vaccination); varicella-zoster virus; HIV (primary infection with acute meningitis); Epstein-Barr virus; arboviruses (dengue, West Nile).
Clinical Features
Fever, severe headache (typically diffuse, worsened by light and sound), neck stiffness (meningism), and photophobia — the cardinal features. Unlike bacterial meningitis: onset is typically less abrupt (over 1–3 days rather than hours); consciousness is usually preserved; rash (petechial/purpuric) is absent (the purpuric rash is specific to meningococcal bacterial meningitis); the patient is uncomfortable but not critically ill.
CSF Findings — The Lumbar Puncture
LP is essential to distinguish from bacterial meningitis: lymphocytic pleocytosis (100–1000 cells, predominantly lymphocytes); protein mildly elevated (50–100mg/dL); glucose normal (CSF:serum ratio above 0.6); Gram stain and bacterial culture negative; viral PCR (enterovirus, HSV) positive. Treatment: supportive — rest, analgesia, antipyretics, adequate hydration. Acyclovir if HSV cannot be excluded. Hospital admission is appropriate until bacterial meningitis is excluded. Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.
Dr. Anand Karnam
DrNB Neurology · Sri Anand CNC, Chanda Nagar Hyderabad · Sri Anand Child and Neuro Center
DrNB-qualified Neurologist, Fellow of the World Headache Society (FWHS), and Headache Specialist with 12+ years of experience treating epilepsy, stroke, migraine, and movement disorders. Practices at Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad.
References & Sources
- 1.Meningitis — WHO Fact Sheet — World Health Organization
- 2.Viral Meningitis — NCBI StatPearls — NCBI StatPearls
- 3.Viral Meningitis — NHS — NHS UK
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