Uh well it causes bilateral interstitial pneumonia which is inflammation that causes irreversible scarring around the air sacs. If you get it you will have scarring. If you get it badly you will have bad scarring that will impact your future health. If you have an underlying health problem esp if it involves your respiratory system you are fucked. Combine all of this with thousands of your neighbors Unable to breath creates a very interesting union in the ER.

Maybe the Wikipedia article on bilateral interstitial pneumonia will change your mind?