Discoid lupus erythematosus is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Discoid lupus erythematosus, or a subtype of Discoid lupus erythematosus, 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 Discoid lupus erythematosus as a "rare disease". More information about Discoid lupus erythematosus is available from Orphanet
The term 'prevalence' of Discoid lupus erythematosus usually refers to the estimated population
of people who are managing Discoid lupus erythematosus at any given time.
The term 'incidence' of Discoid lupus erythematosus refers to the annual diagnosis rate,
or the number of new cases of Discoid lupus erythematosus 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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