Plague Yersinia pestis,gram-negative rod 。Reservoir Rats,ground squirrels,prairie dogs ·Vector ·Xenopsylla cheopsis 。Bubonic plague Bacterial growth in blood and lymph 。Septicemia plague ·Septic shock 。Pneumonic plague 。Bacteria in the lungs• Yersinia pestis, gram-negative rod • Reservoir • Rats, ground squirrels, prairie dogs • Vector • Xenopsylla cheopsis • Bubonic plague • Bacterial growth in blood and lymph • Septicemia plague • Septic shock • Pneumonic plague • Bacteria in the lungs Plague