Prevalence
-
Very common diseases
More than 3 million U.S. cases per year.
-
Common Diseases
More than 200,000 U.S. cases per year.
-
Rare Diseases
Fewer than 200,000 U.S. cases per year.
-
Very Rare Diseases
Fewer than 20,000 U.S. cases per year.
-
Extremley Rare Diseases
Fewer than 1,000 U.S. cases per year.