Exactly What is Aseptic Meningitis?
Aseptic meningitis is an illness characterized by headache, fever and inflammation of the lining of the brains. Aseptic Meningitis looks like bacterial meningitis, bacteria do not grow in cultures of the spinal fluid, which is fluid around the spinal cord and brain.
With aseptic meningitis a person has signs and symptoms of meningitis, but bacteria do not grow in cultures. Many different things can cause aseptic meningitis including viruses, fungi, tuberculosis, some medications and infections near the brain or spinal cord, such as epidural abscesses.
Coxsackie virus and echovirus, two members of a family of viruses called enteroviruses, account for about half the cases of aseptic meningitis. Other enteroviruses, herpes viruses, and mumps are additional causes. The rate of these enteroviral infections increases in summer and early fall.
West Nile virus is a cause of aseptic meningitis that has recently spread across the United States. Usually, West Nile virus causes a self-limited meningitis, which gets better on its own, without treatment. Infrequently, it causes a more severe illness, which may include encephalitis, which is inflammation in the actual brain tissue or paralysis similar to that seen in polio. These severe forms usually occur in elderly people or people with lowered immunity.
Enteroviruses are spread by hand-to-mouth contact and coughing. To a lesser extent, they also spread by contact with fecal matter. Mumps is spread by coughing or contact with secretions from the mouth and throat, with increased incidence in the spring.
Herpesvirus, both type 1 . . . herpes simplex or herpes labialis, and type 2 . . . genital herpes can cause meningitis in children, especially infants. Chicken pox can also cause aseptic meningitis. Rabies virus causes inflammation of both the brain and meninges (meningoencephalitis). HIV can cause aseptic meningitis, especially soon after exposure (acute HIV syndrome).
Some fungi and mycobacteria can cause aseptic meningitis, although this is much less common. Certain medications can also cause aseptic meningitis, including antibiotics and some over-the-counter anti-inflammatory medications.
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Risk factors for aseptic meningitis include exposure to someone with a recent viral infection, exposure to children in a daycare settings, being a health care worker, or having a lower immune system.
Symptoms of Aseptic Meningitis
uneasiness, or ill feeling (malaise)
Nausea and vomiting
Abnormal sensitivity to light (photophobia)
Exams and Tests for Aseptic Meningitis
For any patient with meningitis, it is important to perform a lumbar puncture (spinal tap), where a sample of spinal fluid (known as cerebrospinal fluid, or CSF) is obtained and sent to the lab for testing.
Tests may reveal the following:
High or low white blood cell count in the blood
High white blood cell count in spinal fluid (usually lymphocytes, a type of white blood cells)
Bacterial cultures of spinal fluid do not grow any bacteria. Other cultures or other special tests of spinal fluid may detect viruses, or other forms of infection.
Treatment for Aseptic Meningitis
Treatment is needed for fungal or mycobacterial causes of aseptic meningitis. Herpesvirus/varicella (chicken pox) virus can be treated with anti-viral medicines. Supportive treatment for non-infectious causes consists of pain medications and management of complications, if they occur.
No specific treatment is available for enteroviral aseptic meningitis.
Outlook/Prognosis for Aseptic Meningitis
Aseptic meningitis is usually a harmless disease, and people usually have full recovery in 5 to 14 days after symptoms start.