primary atypical pneumonia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An acute infectious respiratory disease caused by the bacterium Mycoplasma pneumoniae, characterized by fever, coughing, sore throat, and muscle pain.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an acute respiratory disease marked by high fever and coughing; caused by mycoplasma; primarily affecting children and young adults