Other than asthma and "chronic lung disease", what can cause chronic pneumonia?

Poor immunity: Noninfectious as well as infectious processes can result in chronic pneumonia however, infectious disease is the worrisome one including bacteria causing tb, fungi, molds in dwelling, protozoa, parasites.

Fungi and Bacteria: Both fungi and certain bacteria have been associated with chronic pneumonia. Most of the time your doctor will consider doing a bronchosopy (camera procedure in lungs) to determine the etiology of the pneumonia.