about 5 per 100,000 to 14 per 100,000 (NWHIC) ... see also overview of Myasthenia Gravis.
approx 1 in 20,000 or 0.00% or 13,600 people in USA [Source statistic for calcuation: "about 5 per 100,000 to 14 per 100,000 (NWHIC)" -- see also general information about data sources]
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Myasthenia Gravis as a "rare disease". More information about Myasthenia Gravis is available from Orphanet
Myasthenia gravis occurs in about five people per 100,000. (Source: excerpt from MYASTHENIA GRAVIS: NWHIC)
The following statistics relate to the prevalence of Myasthenia Gravis:
16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the prevalence and/or incidence of Myasthenia Gravis.
Myasthenia gravis causes a failure in transmission of nerve impulses at the neuromuscular junction. Theoretically, such impairment may result from an autoimmune response, ineffective acetylcholine release, or inadequate muscle fiber response to acetylcholine. (See Impaired transmission in myasthenia gravis.)
Myasthenia gravis affects 3 of every 10,000 people at any age, but it’s more common in young women and older men. About 20% of neonates born to mothers with myasthenia gravis have transient (or occasionally persistent) myasthenia. This disease may coexist with immunologic and thyroid disorders; about 15% of patients with myasthenia gravis have thymomas. Remissions occur in about 25% of patients.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Myasthenia Gravis usually refers to the estimated population
of people who are managing Myasthenia Gravis at any given time.
The term 'incidence' of Myasthenia Gravis refers to the annual diagnosis rate,
or the number of new cases of Myasthenia Gravis 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.
Footnotes:
1. Rose and Mackay, 1998, The Autoimmune Diseases, Third Edition
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