<s>[INST] Does pneumonia affect the respiratory system? [/INST] Germs causing pneumonia invade the air sacs of the lungs or alveoli causing inflammation and filled with fluid. This causes less oxygen to reach the blood. Breathing becomes labored. Source: MedIndia. Link: https://www.medindia.net/patients/patientinfo/pneumonia-faq.htm. Field: Lung Disease. Disease: Pneumonia </s>