rare ... see also overview of Hallervorden-Spatz disease.
Hallervorden-Spatz disease is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Hallervorden-Spatz disease, or a subtype of Hallervorden-Spatz disease, affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Hallervorden-Spatz disease as a "rare disease". More information about Hallervorden-Spatz disease is available from Orphanet
The term 'prevalence' of Hallervorden-Spatz disease usually refers to the estimated population of people who are managing Hallervorden-Spatz disease at any given time. The term 'incidence' of Hallervorden-Spatz disease refers to the annual diagnosis rate, or the number of new cases of Hallervorden-Spatz disease 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.
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