The first written account of pneumonia dates back to Hippocrates (460–370 BC) in Greece, according to News Medical. However, Hippocrates referred to it as a disease named by the ancients, so the disease was known even before his time.
Edwin Klebs is credited with the discovery in 1875 of bacteria in the airways of deceased pneumonia patients, states News Medical. Carl Friedlander and Albert Frankel identified two strains of bacterial pneumonia in 1882 and 1884, respectively.
The Centers of Disease Control lists the more recent discovery of Mycoplasma pneumoniae, an atypical form of the disease, as occurring in 1944.
Hippocrates' account not only named pneumonia, but also described its symptoms such as pain and cough and the color and consistence of mucous, News Medical states.