Questions Swirl Over Who Will be Covered in WTC Health Act

Only a few diseases were singled out by name in the act, including asthma and a handful of other respiratory ailments.

Federal administrators still have to decide whether to cover other conditions, like cancer.

Doctors say deciding which diseases are linked to ground zero and which occurred naturally could be tough.

Tens of thousands of people were involved in the trade center cleanup. Many are now middle aged, when illnesses of all types become more common.