How many people in the U.S. suffer from Phenylketonuria (PKU)?

Answer 1

INCIDENCE:

Classic PKU and the other causes of hyperphenylalaninemia
affect about one of every 10,000 to 20,000 Caucasian or
Oriental births. The incidence in African Americans is far
less. These disorders are equally frequent in males and
females.

CAUSE:

PKU and the other causes of hyperphenylalaninemia are
inherited in a recessive fashion. This means an affected
person inherited two traits for the disorder (e.s., one from
each parent). A person with one trait for the disorder, is
called a 'carrier' for PKU. Carriers do not have symptoms
of the disorder.