The three clinical forms of plague are bubonic, pneumonic, and septicemic. Bubonic plague is the best-known form in popular lore, and indeed it constitutes about three-fourths of plague cases. In pneumonic plague the lungs are extensively invaded by bacilli. In septicemic plague the bloodstream is so invaded by Yersinia that, in untreated cases, death can ensue even before the bubonic or pneumonic forms have had time to appear.
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