African Sleeping sickness is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that African Sleeping sickness, or a subtype of African Sleeping sickness, 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 African Sleeping sickness as a "rare disease". More information about African Sleeping sickness is available from Orphanet
For details see incidence of types of African Sleeping sickness analysis; summary of available incidence by type data:
The term 'prevalence' of African Sleeping sickness usually refers to the estimated population
of people who are managing African Sleeping sickness at any given time.
The term 'incidence' of African Sleeping sickness refers to the annual diagnosis rate,
or the number of new cases of African Sleeping sickness 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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