Viral Meningitis

Yesterday, we talked about Bacterial Meningitis. Today, we will cover Viral Meningitis.

Viral meningitis is generally less severe and resolves without specific treatment.

Causes

Most viral meningitis cases in the United States, especially during the summer months, are caused by enteroviruses; however, only a small number of people with enterovirus infections actually develop meningitis.

Other viral infections that can lead to meningitis include

  • Mumps
  • Herpesvirus, including Epstein-Barr virus, herpes simplex viruses, varicella-zoster virus (which also causes chicken pox and shingles), measles, and influenza
  • Viruses spread through mosquitoes and other insects (arboviruses)
  • In rare cases LCMV (lymphocytic choriomeningitis virus), which is spread by rodents, can cause viral meningitis

Signs & Symptoms

Meningitis infection is characterized by a sudden onset of fever, headache, and stiff neck. It is often accompanied by other symptoms, such as

  • Nausea
  • Vomiting
  • Photophobia (sensitivity to light)
  • Altered mental status

Viral meningitis is an infection of the meninges (the covering of the brain and spinal cord) that is caused by a virus. Enteroviruses, the most common cause of viral meningitis, appear most often during the summer and fall in temperate climates.

Viral meningitis can affect babies, children, and adults. It is usually less severe than bacterial meningitis and normally clears up without specific treatment. The symptoms of viral meningitis are similar to those for bacterial meningitis, which can be fatal. Because of this, it is important to see a healthcare provider right away if you think you or your child might have meningitis.

Symptoms of viral meningitis in adults may differ from those in children:

Common symptoms in infants

  • Fever
  • Irritability
  • Poor eating
  • Hard to awaken

Common symptoms in adults

  • High fever
  • Severe headache
  • Stiff neck
  • Sensitivity to bright light
  • Sleepiness or trouble waking up
  • Nausea, vomiting
  • Lack of appetite

The symptoms of viral meningitis usually last from 7 to 10 days, and people with normal immune systems usually recover completely.

Diagnosis

If meningitis is suspected, samples of blood or cerebrospinal fluid (near the spinal cord) are collected and sent to the laboratory for testing. It is important to know the specific cause of meningitis because the severity of illness and the treatment will differ depending on the cause.

The specific causes of meningitis may be determined by tests used to identify the virus in samples collected from the patient.

Treatment

There is no specific treatment for viral meningitis. Antibiotics do not help viral infections, so they are not useful in the treatment of viral meningitis. Most patients completely recover on their own within 7 to 10 days. A hospital stay may be necessary in more severe cases or for people with weak immune systems.

Prevention

People with certain viral infections can sometimes develop meningitis. There are no vaccines for the most common causes of viral meningitis. Thus, the best way to prevent it is to prevent viral infections. However, that can be difficult since sometimes people can be infected with a virus and spread the virus even though they do not appear sick. Following are some steps you can take to help lower your chances of becoming infected with viruses or of passing one on to someone else:

  • Wash your hands thoroughly and often, especially after changing diapers, using the toilet, or coughing or blowing your nose.
  • Clean contaminated surfaces, such as doorknobs or the TV remote control, with soap and water and then disinfect them with a dilute solution of chlorine-containing bleach.
  • Avoid kissing or sharing a drinking glass, eating utensil, lipstick, or other such items with sick people or with others when you are sick.
  • Make sure you and your child are vaccinated. Vaccinations included in the childhood vaccination schedule can protect children against some diseases that can lead to viral meningitis. These include vaccines against measles and mumps (MMR vaccine) and chickenpox (varicella-zoster vaccine).
  • Avoid bites from mosquitoes and other insects that carry diseases that can infect humans.
  • Control mice and rats. If you have a rodent infestation in and/or around your home, follow the cleaning and control precautions listed on CDC’s website about LCMV (Lymphocytic choriomeningitis virus).

Source: CDC

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