Plagues Caused By Yersinia Pestis

How is Yersinia pestis transmitted in bubonic plague?

Flea bites

What are key symptoms of bubonic plague caused by Yersinia pestis?

Painful swollen lymph nodes (buboes), fever, chills

What is the untreated mortality rate for bubonic plague caused by Yersinia pestis?

40–60%

What happens during septicemic plague caused by Yersinia pestis?

Systemic bloodstream infection

What are symptoms of septicemic plague caused by Yersinia pestis?

Gangrene, disseminated intravascular coagulation, overwhelming bacteremia

What is the untreated mortality rate for septicemic plague caused by Yersinia pestis?

50–90%

How is pneumonic plague caused by Yersinia pestis transmitted?

Person-to-person aerosol; also from septicemic spread to lungs

What are symptoms of pneumonic plague caused by Yersinia pestis?

Pneumonia, coughing blood, rapid respiratory failure

What is the untreated mortality rate for pneumonic plague caused by Yersinia pestis?

95–100% (must treat within 24 hours)

Other Methods of Transmission

Handling infected animals (scratches, bites) and ingesting infected meat