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Bejel is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Bejel, or a subtype of Bejel, affects less than 200,000 people in the US population.
The term 'prevalence' of Bejel usually refers to the estimated population
of people who are managing Bejel at any given time.
The term 'incidence' of Bejel refers to the annual diagnosis rate,
or the number of new cases of Bejel 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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