Pneumonia is a potentially serious infection of the lungs caused by bacteria, viruses or rarely fungi. Patients with Cystic fibrosis (an inherited disease that causes thick, sticky mucus to build up in the lungs, and other areas of the body) are prone to developing recurrent chest infections including pneumonia because the mucus in the lungs is thicker and not cleared so easily. This can trap bacteria and lead to infection and inflammation. Below you may find medications used to treat or help with Pneumonia With Cystic Fibrosis. More about Pneumonia with Cystic Fibrosis