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