In Russia he had contracted a nasty case of pneumonia, similar to the one that killed his first wife.
Spread happens easily, however, and epidemics are propagated when the third form of plague occurs: pneumonia plague.
Measles can lead to lung infections such as pneumonia, and untreated, it can often be fatal.
c.1600, from Modern Latin, from Greek pneumonia "inflammation of the lungs," from pneumon "lung," altered (perhaps by influence of pnein "to breathe") from pleumon "lung," literally "floater," probably cognate with Latin pulmo (see pulmonary), from PIE *pleu- "to flow, to swim" (see pluvial). Alteration in Greek perhaps by influence of pnein "to breathe."
pneumonia pneu·mo·nia (nu-mōn'yə, nyu-)
An acute or chronic disease marked by inflammation of the lungs and caused by viruses, bacteria, or other microorganisms and sometimes by physical and chemical irritants.
An acute or chronic disease marked by inflammation of the lungs, especially an infectious disease caused by viruses, bacteria, or other pathogens, such as mycoplasmas. Individuals with pneumonia often have abnormal chest x-rays that show areas with fluid in the infected part of the lungs.