Khan Academy on a Stick
Pneumonia vs. pneumonitis
Pneumonitis is a term used to describe inflammation of the lung tissues without the presence of an infection, whereas pneumonia is inflammation caused by an infection. Learn what the symptoms of pneumonitis are, and why pneumonitis is more common with bird handlers, farmers, and people who regularly use humidifiers.
The video could not be loaded, either because the server or network failed or because the format is not supported.
If the above player doesn't work, try this direct link.