N-acetyl-cysteine is brilliant for any bronchial problems. This is also known to thin mucous making it an unfavourable place to be for parasites as they love thick, gooey mucous.
Also vitamin E is necessary for good, healthy, strong lungs. Vitamin E increases oxygen uptake and parasites hate oxygen......I would aim for up to 150 mg a day if you don't suffer from high blood pressure or take blood thinning medicine. Must be taken in conjuction with vitamin C.