Actually the week of biaxin should cover your respiratory problem if it is truly a bronchitis. You have two things going on possibly. This will entail more blood work, but the chest x-ray itself should be at a minimum. Hope this helps. Acute interstitial pneumonia just describes a type of pneumonia.
Pneumonia is an infection of the lung, which can be caused by a virus, bacteria, or a chemical.
The usual manner in which people think about pneumonia is acquiring it from other people, as it can be spread by respiratory droplets from coughing. Smoking history predisposes many to pneumonia. It is very dangerous in the elderly due to their poor immune systems, and often have to be hospitalized to receive IV antibiotics and fluids. Hope this helps.