Bacteria. But otherwise you are correct.
“Bacteria. But otherwise you are correct.”
No, that is deadly wrong. It is the pneumonic plague that is the culprit behind the historical pandemics, and it certainly is not just a blood borne disease at all. It is a danger because it is transmitted through the air by coughs, sneezes, and not just by blood contact through fleas. Furthermore, it is a specific change in a gene/s which occurs on occasion which makes it extraordinarily capable of suppressing and/or circumventing the normal human immune responses which makes it so much more deadly than your run of the mill version of the pathogen you see in virtually all of today’s cases.