primary atypical pneumonia
any of numerous acute types of pneumonia, formerly referring to any type other than bacterial pneumonia. Causative organisms include Mycoplasma pneumoniae (see mycoplasmal pneumonia) and species of Rickettsia, and Chlamydia, as well as viruses (see viral pneumonia). All are marked by extensive but short-lived pulmonary infiltration, fever, malaise, muscle pains, sore throat, and coughing.
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