Prevalence and Incidence of Meningitis

Incidence (annual) of Meningitis:

approximately 25,000 cases of bacterial meningitis annually in USA; 206 annual cases in Victoria 1996 (DHS-VIC)

Incidence Rate:

approx 1 in 10,879 or 0.01% or 25,000 people in USA [about data]

Incidence extrapolations for USA for Meningitis:

25,000 per year, 2,083 per month, 480 per week, 68 per day, 2 per hour, 0 per minute, 0 per second.

Incidence of types of Meningitis:

For details see incidence of types of Meningitis analysis; summary of available incidence by type data:

• Viral meningitis: 8,932 new cases in America 1995 (Meningitis Foundation of America, CDC, 1994)
• Meningococcal Meningitis: 2,501 annual cases notified in USA 1999 (MMWR 1999)
• Pneumococcal meningitis: about 1 to 2 per 100,000 in the USA
• Cryptococcal Meningitis: about 5 per million

Prevalence/Incidence of Meningitis: Online Medical Books

16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the prevalence and/or incidence of Meningitis.

Headache: Causes and incidence
(Professional Guide to Diseases (Eighth Edition))

Most chronic headaches result from tension (muscle contraction), which may be caused by emotional stress, fatigue, menstruation, or environmental stimuli (noise, crowds, or bright lights). Other possible causes include glaucoma; inflammation of the eyes or mucosa of the nasal or paranasal sinuses; diseases of the scalp, teeth, extracranial arteries, or external or middle ear; muscle spasms of the face, neck, or shoulders; and cervical arthritis. In addition, headaches may be caused by vasodilators (nitrates, alcohol, and histamine), systemic disease, hypoxia, hypertension, head trauma and tumor, intracranial bleeding, abscess, or aneurysm.

The cause of migraine headache is unknown, but it’s associated with constriction and dilation of intracranial and extracranial arteries. Certain biochemical abnormalities are thought to occur during a migraine attack. These include local leakage of a vasodilator polypeptide called neurokinin through the dilated arteries and a decrease in the plasma level of serotonin.

Headache pain may emanate from the pain-sensitive structures of the skin, scalp, muscles, arteries, and veins; cranial nerves V, VII, IX, and X; or cervical nerves 1, 2, and 3. Intracranial mechanisms of headaches include traction or displacement of arteries, venous sinuses, or venous tributaries and inflammation or direct pressure on the cranial nerves with afferent pain fibers.

Affecting up to 10% of Americans, headaches are more common in females and have a strong familial incidence.

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Meningococcal infections: Causes and incidence
(Professional Guide to Diseases (Eighth Edition))

Meningococcal infections usually occur among children (ages 6 months to 1 year) and men, usually military recruits or those enrolled at institutions, such as colleges, because of overcrowding.

N. meningitidis has seven serogroups (A, B, C, D, X, Y, and Z); group A causes most epidemics. Transmission takes place through inhalation of an infected droplet from a carrier (an estimated 2% to 38% of the population). The bacteria localize in the nasopharynx. After incubating approximately 3 to 4 days, they spread through the bloodstream to joints, skin, adrenal glands, lungs, and the central nervous system. The tissue damage that results (possibly due to the effects of bacterial endotoxins) produces symptoms and, in fulminating meningococcemia and meningococcal bacteremia, hemorrhage, thrombosis, and necrosis.

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West Nile encephalitis: Causes and incidence
(Professional Guide to Diseases (Eighth Edition))

WNV is transmitted to humans by the bite of a mosquito (primarily the Culex species) infected with the virus. It's considered the primary vector for WNV and the source of the August 1999 outbreak in New York, New Jersey and Connecticut. Mosquitoes become infected by feeding on birds contaminated with the West Nile virus and then transmitting it to humans and animals during a blood meal or “bite.” (See Transmission routes of West Nile virus, page 256.)

Ticks have been found infected with WNV in Africa and Asia only. The role of ticks in the transmission and maintenance of the virus remains uncertain, and to date they aren't considered vectors for WNV in the United States.

The Centers for Disease Control and Prevention has reported that there is no evidence that a person can contract the virus from handling live or dead infected birds. However, avoid barehanded contact when handling dead animals, including birds, and use gloves or double plastic bags to dispose of a carcass. Report the finding to the local health department.

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About prevalence and incidence statistics:

The term 'prevalence' of Meningitis usually refers to the estimated population of people who are managing Meningitis at any given time. The term 'incidence' of Meningitis refers to the annual diagnosis rate, or the number of new cases of Meningitis diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.