The Black Death

Three forms of disease‣Enzootic in rodents‣Sometimes spreads into human, usually by flea bites‣Most cases are bubonic – lymph nodes‣Some are septicemic – blood‣Or pneumonic – get into lungs – highly infectious‣Human – human transmission‣Pneumonic form – consisting of infected droplets inhaled by closecontacts‣Symptoms seen in ~3 days, death in ~6 days