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