Deep in the lungs, we can see the clusters of tiny air sacs — the alveoli — becoming inflamed and filling with pus, making it difficult to breathe.
In this sequence of images, we can see the pus building up inside the sacs (the second image is earlier in the sequence).
Pneumonia is an infection of the lungs caused by bacteria, viruses, or even fungi.
Look to the link below for the animation sequence.
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click on image to enlarge — use arrows to view frames
