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