Definition | Causes | Risk Factors | Symptoms | Diagnosis | Treatment | Prevention

Definition

The brain and spinal cord are covered by layers of tissue. These layers are called the meninges. Certain bacteria can cause an infection in these layers. This is called bacterial meningitis.

It is a serious infection that can cause death within hours. Quick diagnosis and treatment is vital.

Bacterial Meningitis

Meningitis
Copyright © Nucleus Medical Media, Inc.

Causes

Many times, the bacteria first cause an upper respiratory tract infection. Then, it travels through the blood stream to the brain.

Worldwide, three types of bacteria cause the majority of cases of acute bacterial meningitis:

  • Streptococcus pneumoniae (the bacteria that causes pneumonia)
  • Neisseria meningitidis
  • Haemophilus influenzae b (Hib)
    • In the United States, widespread immunization has almost eliminated meningitis due to Hib

Other forms of bacterial meningitis include:

  • Listeria monocytogenes meningitis
  • Escherichia coli meningitis
  • Mycobacterium tuberculosis meningitis
  • Group B Streptococcus meningitis

Newborn babies and the elderly are more prone to get sick.

Some forms are spread by direct contact with fluid from the mouth or throat of an infected person. This can happen during a kiss or by sharing eating utensils. In general, meningitis is not spread by casual contact.

Risk Factors

Risk factors for meningitis include:

Symptoms

Classic symptoms can develop over several hours or may take one to two days:

  • High fever
  • Headache
  • Very stiff, sore neck

Other symptoms may include:

  • Red or purple skin rash
  • Bluish skin color
  • Nausea
  • Vomiting
  • Sensitivity to bright lights
  • Sleepiness
  • Mental confusion

In newborns and infants, symptoms are hard to see. As a result, infants under three months old with a fever are often checked for meningitis. Symptoms in newborns and infants may include:

As the illness progresses, seizures and/or hearing loss can occur. This can happen to patients of all ages.

Diagnosis

Your doctor will ask about your symptoms and medical history. A physical exam will be done.

Tests may include the following:

  • Spinal tap—removal of a small amount of cerebrospinal fluid to check for bacteria
  • Other cultures—testing samples of blood, urine, mucous, and/or pus from skin infections
  • MRI—a test that uses magnetic waves to make pictures of structures inside the body (to be sure the inflammation is not from some other cause, such as a tumor)
  • CT—a type of x-ray that uses a computer to make pictures of structures inside the body

Treatment

More than 90% of all people with this infection survive with immediate care, including:

  • Antibiotics and corticosteroids—often given together
  • Fluids

Talk with your doctor about the best plan for you.

Antibiotics are given through an IV. This is started as soon as the infection is suspected. The antibiotics may be changed once tests name the exact bacterial cause. Patients usually stay in the hospital until a fever has fallen. The fluid around the spine and the brain must also be clear of infection.

These are usually given by IV early in treatment. They control brain pressure and swelling. They also reduce the body’s production of inflammatory substances. This treatment can prevent further damage.

Fluids can be lost due to fever, sweating, or vomiting. They may be replaced through an IV. It will be done carefully to avoid complications of fluid overloading.

  • Pain medications and sedatives may be used
  • Anticonvulsants may be prescribed to prevent seizures

Prevention

To help reduce your chances of getting bacterial meningitis, consider the following steps: