Other than the lymphatic system, the lungs are the organ most commonly affected by bubonic plague. Ten to 20 percent of people with bubonicplague will also develop symptoms in the lungs (also known as pneumonic plague).
Bubonic plague symptoms in the lungs can include:
Cough
Fever
Increased breathing
Difficulty breathing
Coughing up blood
Respiratory failure
Acute respiratory distress syndrome (ARDS).
Death typically occurs within two to six days. When bubonic plague reaches the lungs, the mortality rate is 75 percent, despite appropriate plague treatment.