Unless you run into a situation where both boy and girl dating find out they are carriers…..the average person does not even need to know that they are a carrier. That is undisclosed information from Dor Yeshorim. Being a carrier means nothing…unless you marry someone who is also a carrier.
both husband and wife need to BOTH be carriers for a diseased
child to be a possibility chas’v’sholom. Good Health to all!