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