My husband with Legionnaires’ disease has no chronic illnesses.

My husband has been diagnosed with Legionnaires’ disease, but has no underlying risk factors that we know of. He was cured with erythromycin. He is 38 years old. Should we be concerned about his immune system and should his doctor be looking for reasons that he contracted this?

The answer may be yes, since it is unusual for nonsmokers to contract Legionnaires’ disease. Did he stay at a hotel or other large building in the 10 days before symptoms?