Is Meningitis Contagious?

  • Medical Author:
    Charles Patrick Davis, MD, PhD

    Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.

  • Medical Editor: William C. Shiel Jr., MD, FACP, FACR
    William C. Shiel Jr., MD, FACP, FACR

    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Meningitis Treatment

In some situations, anticonvulsants are used to prevent or treat seizures (a possible side effect of inflammation of the brain). Sometimes corticosteroids are administered to reduce brain swelling and inflammation. Sedatives may be needed for irritability or restlessness.

What is meningitis?

Meningitis is inflammation of the membranes (meninges) that surround the brain and the spinal cord. The usual signs and symptoms of meningitis are headache, fever, and a stiff neck. There are many types of meningitis. Often meningitis is named according to the cause. For example, there are viral, bacterial, noninfectious (aseptic), and many other types of meningitis.

Is meningitis contagious?

The contagiousness is related to the specific agent that causes the disease. The following is a summary of five types of meningitis and how they may or may not be contagious.

  • Viral meningitis: Meningitis caused by many viruses is usually contagious. However, certain viruses that are transmitted by mosquitoes are usually not spread person to person, so they are not contagious.
  • Bacterial meningitis: Bacterial meningitis is usually contagious; some bacteria more highly contagious (such as Neisseria meningitidis in young adults and Streptococcus pneumoniae in all ages) than others.
  • Fungal meningitis: Fungal meningitis (for example, Cryptococcus meningitis) is not considered to be contagious.
  • Parasitic meningitis: Parasitic meningitis, which is rare (for example, Naegleria fowleri), is not considered to be contagious from person to person.
  • Noninfectious meningitis: Noninfectious meningitis is not a result of infection but is from an underlying condition or disease and not considered contagious. Causes of noninfectious meningitis include cancers in and around the brain or spinal cord, drugs, head injury, and autoimmune disease (such as lupus or Behçet's disease).

How contagious is meningitis?

In short, most bacterial meningitis infections are mildly to moderately contagious person to person, while some viral meningitis are contagious but other types are not. Fungal, parasitic, and noninfectious causes of meningitis are not contagious from one person directly to another.

How long is meningitis contagious?

This depends upon which infectious agents are causing the meningitis. In general, when the patient is secreting or producing viruses or bacteria, they are considered contagious. When the patient stops secreting or producing infectious agents is when meningitis is no longer contagious. Viral caused meningitis may be contagious from three days after infection starts to about 10 days after the symptoms develop. Bacterial meningitis is usually less contagious than viral; depending on the bacterial genus causing the infection, it may be contagious during the incubation period and for about an additional seven to 14 days. And they can be contagious for much longer (many days to months) if the person becomes a carrier. The contagious period may be shortened with antibiotic treatments.

What is the incubation period for meningitis?

The incubation period for bacterial meningitis, the most serious types of meningitis, is about three to five days after initial contact with the microbe. However, in some individuals, bacterial meningitis symptoms can occur as rapidly as 24 hours. For viral meningitis, the incubation period can range widely from only a few days to a few weeks. Patients who get meningitis usually have symptoms of headache, fever, and a stiff neck. They may also develop nausea and vomiting, photophobia, and alteration of their mental state. Children with meningitis may appear to be lethargic, drowsy, have a high-pitched cry, may develop a rash, and dislike being held.

Besides the history and physical exam, the physician is likely to do a spinal tap to analyze spinal fluid to detect the agent involved. Bacteria, viruses, or other agents may be identified by subsequent tests of the spinal fluid, including microscopic identification, culture, and immunological tests. In addition, blood and urine samples are also analyzed. Identification of the precise microbe allows the physician to diagnose the type of meningitis and proceed with accurate treatments.

Medically Reviewed by a Doctor on 8/16/2016

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