What is the difference between typical and atypical pneumonia?

Causing agents type: Typical pneumonia caused by typical organisms found in the resoiratory system such as strep pneumonia, staph aureus, klebsiella pneumonia, moraxella cataralis. And atypical pneumonia is cause by atypical organisms, but when one usually address it as such means mycoplasma pneumonia which is not a complete bacteria from microbiology point of view. Shahzeidi, md.