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