MedGen

A pneumonia caused by Legionella pneumophila and other Legionella species, which is characterized by fever, cough, progressive respiratory distress, and which is often accompanied by extrapulmonary manifestations. [from NCI]

Legionellosis or Legionnaires' disease (LD) is a bacterial lung infection characterized by a potentially fatal pneumonia. [from ORDO]

An infection acquired in a hospital or other healthcare setting. [from NCI]

A disorder which is not a natural consequence or progression of any pre-existing disorder, resulting from a diagnostic procedure or any form of therapy that is not an intended or expected outcome of its use. [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]