The Plague: Bubonic, Pneumonic, and Septicemic Forms

The Plague (Black Death) is one of history's deadliest pandemics, caused by Yersinia pestis.

Forms

  • Bubonic Plague: Most common; transmitted by rodent fleas (e.g., rats). Causes swollen lymph nodes (buboes).
  • Pneumonic Plague: Spread via respiratory droplets; highly contagious; affects lungs.
  • Septicemic Plague: Bacteria enter bloodstream directly; causes sepsis, organ failure; can arise from untreated bubonic/pneumonic forms.

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