Additional clarification - it's also my understanding that the difference
between galactosemia and primary lactase deficiency is that with
galactosemia, the enzyme that's missing is GART (Galactose-1-phosphate
uridyltransferase) and with primary lactase deficiency, the enzyme missing
is lactase. However, both conditions boil down to the same thing - the baby
is unable to digest lactose. I believe primary lactase deficiency in the
infant can also be fatal if not caught in time. My understanding is that
primary lactase deficiency *in the infant* is even rarer than galactosemia.
The number I saw was 1 in every 100,00 to 200,000 infants, as compared to 1
in 85,000 for galactosemia.

Kerry

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