Are people with open asd more likely to get sick?

No: An ASD rarely causes any symptoms in children. It does not affect the ability of the body to fight infection.

Possibly : Unlikely to be a measurable difference except for bacterial endocarditis paradoxical, embolism, and if large late heart failure.

Possibly: This depends on the size of the asd, age of the patient, and whether the ASD has been repaired. Small asds may have no effect while a large ASD that has been left untreated for a long time (e.g. 4o years etc) can certainly lead to more illnesses.