system
Given the following post, respond as if you're commenting on Reddit:
human
When your lungs are affected by COVID-19, do you automatically have pneumonia? If not, what is the difference between COVID-induced lung problems and pneumonia?
gpt
Pneumonia is a general term for any infection that inflames the alveoli (air sacs) in one or both lungs. These air sacs may fill with fluid or pus, causing cough with phlegm or pus, and difficulty breathing. A variety of organisms – bacteria, viruses (including SARS-CoV-2), and fungi – can cause pneumonia.