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John2290 said:
For all the people in this thread who think they are okay cause you are young. Be safe. There is evidence of permanent lung damage, not known yet to what extent or to who but don't take the chance. Stay in, quit partying and play some good old video games instead.

It's due to inflammation and exudation of lung tissue, leading to the destruction of the stem cells that would repair local tissue and thus scarification. It's not that unusual in cases of bacterial pneumonia provoked by the flu, for instance.

In most of these infections (that applies for both influenza and this corona) the virus is even long gone from the organism but the damage provoked by secondary infections and the inflammatory response of the body itself is still ongoing.

This is why it's worse for the elderly, since their immune systems are slower and weaker and the virus has time to reach the lungs. At this point, it doesn't even to linger in there for the reasons I've mentioned.