I read about some of the most common prion diseases and as far as I can tell, all the transmissible ones require the ingestion of infected material. While a tra

I read about some of the most common prion diseases and as far as I can tell, all the transmissible ones require the ingestion of infected material. While a transmissible prion epidemic that spreads through the air would be really scary, it doesn't seem especially likely as an existential threat in our lifetimes.