the.com/pneumonia

Pneumonia fills the lungs with fluid, making it painful and hard to breathe.

means An infection that inflames the air sacs in one or both lungs, filling them with fluid or pus and making it hard to breathe.

from From Greek 'pneumon' meaning lung (itself tied to 'pnein,' to breathe), plus the medical suffix '-ia' denoting a condition. The 'pn-' spelling is a fossil of Greek pronunciation — English keeps the silent 'p' as a little relic of the word's ancient lungful of breath.

old nickname
once called the old man's friend
why friend
killed painlessly before antibiotics existed
main culprit
streptococcus pneumoniae, a bacterium, not a virus
vaccine exists
yes, and it actually works well
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