MedGen

Pneumonia caused by Mycoplasma pneumoniae. Signs and symptoms include productive cough, fever, chills, shortness of breath, and chest pain. [from NCI]

Any disease of sudden onset AND/OR short duration [from SNOMEDCT_US]

Acute infection of the lung parenchyma caused by bacteria (e.g., Streptococcus pneumoniae, Haemophilus influenzae, Chlamydia pneumoniae, Mycoplasma pneumoniae, and Legionella pneumophila). Signs and symptoms include productive cough, fever, chills, shortness of breath, and chest pain. [from NCI]