1) Epiglottitis is a condition in which the epiglottis is inflamed. It is commonly caused by bacterial infection. Explain why this type of infection is life threatening. 2) Pneumonia is an infectious disease in which fluid accumulates in the alveoli, patients who are diagnosed with pneumonia are monitored for their oxygen saturation levels. describe how pneumonia could affect the amount of oxygen in the blood. 2) Pneumonia is an infectious disease in which fluid accumulates in the alveoli, patients who are diagnosed with pneumonia are monitored for their oxygen saturation levels. describe how pneumonia could affect the amount of oxygen in the blood..