Bacterial Meningitis
A medical emergency: bacterial infection of the brain's linings
Quick Facts
- Type: Serious central nervous system infection
- Classic signs: Fever, severe headache, stiff neck
- Urgency: Medical emergency — treat immediately
- Prevention: Vaccines for several causes
Overview
Bacterial meningitis is a medical emergency. If you suspect it, seek emergency care immediately. It is an infection in which bacteria inflame the meninges, the protective membranes covering the brain and spinal cord. The inflammation and the body's response can rapidly cause serious harm, and without prompt treatment the condition can be fatal or leave lasting complications within hours.
Bacterial meningitis differs from the more common viral meningitis, which is usually milder. Because bacterial meningitis can worsen so quickly and is potentially deadly, it is treated urgently, often before all test results are back. Many cases can be prevented with vaccines, and prompt antibiotics save lives. Recognizing the warning signs and acting fast is the single most important step.
Symptoms
Symptoms often come on quickly, over hours to a day or two. Classic features include:
- Sudden high fever
- Severe headache that feels different from usual
- Stiff neck, making it hard to lower the chin to the chest
- Sensitivity to light
- Nausea and vomiting
- Confusion, drowsiness, or difficulty waking
- Seizures
- A rash of red or purple spots that do not fade when pressed (a sign of a serious bloodstream infection that may accompany some forms)
In babies, signs can be subtle: fever or low temperature, poor feeding, irritability, a high-pitched cry, excessive sleepiness, or a bulging soft spot on the head. Any suspicion of meningitis needs emergency care without delay.
Causes
Bacterial meningitis is caused by several types of bacteria that reach the membranes around the brain and spinal cord, often after spreading through the bloodstream from another site such as the nose, throat, sinuses, or ears.
- Common bacteria: Including those responsible for meningococcal, pneumococcal, and Haemophilus infections, with the typical organisms varying by age.
- Spread: Some bacteria pass between people through respiratory droplets and close contact, such as coughing, kissing, or living in close quarters.
- Direct spread: Infection can extend from a nearby sinus or ear infection, or enter after a head injury, surgery, or through a defect in the skull.
Risk Factors
- Missing recommended vaccinations
- Young age (infants) and certain age groups such as adolescents and young adults living in close quarters
- A weakened immune system or absent or non-functioning spleen
- Crowded living conditions, such as dormitories or military barracks
- Recent ear or sinus infections, head injury, or neurosurgery
- Certain chronic medical conditions
Diagnosis
Because speed is critical, diagnosis and treatment often proceed together.
- Lumbar puncture (spinal tap): The key test, in which a sample of the fluid around the spinal cord is examined for bacteria and signs of infection.
- Blood tests and cultures: To detect infection and identify the bacteria.
- Imaging: A CT scan of the head may be done in some cases before the spinal tap.
- Rapid assessment: Antibiotics are usually started immediately when bacterial meningitis is suspected, even before all results return.
Treatment
Treatment is urgent and given in hospital, often beginning the moment bacterial meningitis is suspected. Do not delay seeking care.
- Intravenous antibiotics: Started immediately and given through a vein; the choice is refined once the specific bacterium is identified.
- Corticosteroids: Used in some cases to reduce inflammation and the risk of complications.
- Supportive care: Fluids, oxygen, treatment of seizures, and close monitoring, sometimes in intensive care.
- Treating complications: Such as brain swelling, low blood pressure, and the effects of a bloodstream infection.
- Preventive antibiotics for close contacts: People in close contact with someone who has certain forms may be given antibiotics to prevent spread.
With fast treatment many people recover, though some are left with complications such as hearing loss, learning difficulties, or other neurological effects.
Prevention
Vaccination is the most effective protection against many causes of bacterial meningitis.
- Stay up to date with recommended vaccines, including those against meningococcal, pneumococcal, and Haemophilus bacteria
- Practice good hygiene, including handwashing and covering coughs and sneezes
- Avoid sharing items like drinks, utensils, or lip products
- Seek treatment for ear and sinus infections
- Take preventive antibiotics if advised after close contact with a case
When to See a Doctor
Bacterial meningitis is a medical emergency. Seek emergency care or call emergency services immediately if you or someone else has:
- Sudden high fever with a severe headache and a stiff neck
- Confusion, drowsiness, or difficulty waking
- A seizure
- Sensitivity to light with nausea and vomiting
- A rash of red or purple spots that do not fade when pressed
- In a baby: fever, poor feeding, a high-pitched cry, floppiness, or a bulging soft spot
Do not wait. Early antibiotics can be life-saving.
Frequently Asked Questions
Is bacterial meningitis an emergency?
Yes. Bacterial meningitis can worsen within hours and be fatal without rapid treatment. If you suspect it, especially with high fever, severe headache, and a stiff neck, seek emergency care immediately.
How is bacterial meningitis different from viral meningitis?
Bacterial meningitis is usually far more serious and can be life-threatening, requiring urgent antibiotics. Viral meningitis is more common and generally milder, often improving with supportive care. Because the two can look similar at first, prompt evaluation is essential.
What are the warning signs in babies?
In infants, signs can be subtle and include fever or low temperature, poor feeding, irritability, a high-pitched cry, unusual sleepiness or floppiness, and a bulging soft spot on the head. Any of these warrants emergency assessment.
Can bacterial meningitis be prevented?
Many cases can be prevented with vaccines against the common bacteria, such as meningococcal, pneumococcal, and Haemophilus types. Good hygiene, not sharing drinks or utensils, and preventive antibiotics for close contacts of certain cases also help.
Does bacterial meningitis cause lasting effects?
With fast treatment many people recover well, but some are left with complications such as hearing loss, learning difficulties, seizures, or other neurological problems. Early treatment lowers the risk of lasting harm.
References
- Centers for Disease Control and Prevention (CDC). Bacterial Meningitis.
- MedlinePlus, U.S. National Library of Medicine. Meningitis.
- Mayo Clinic. Meningitis.
- World Health Organization (WHO).