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Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Oro acral syndrome as a "rare disease". More information about Oro acral syndrome is available from Orphanet
The term 'prevalence' of Oro acral syndrome usually refers to the estimated population
of people who are managing Oro acral syndrome at any given time.
The term 'incidence' of Oro acral syndrome refers to the annual diagnosis rate,
or the number of new cases of Oro acral syndrome 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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