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I’m not sure the color extrapolation to pus is justified.

Yep pus is what animal bodies excrete in response to some infections -- there's no reason to think standalone viruses would naturally summon pus.

Excellently written, informative, entertaining and a bit scary. Oceans of slime yet viruses are so small. It is mind-blowing to think about.

Haha of course it was! Thanks for the link.