There are a plethora of diseases out there. Diseases we don’t know about. Diseases locked away in far-off, rarefied corners of the world. Diseases that operate in small niche jungle environments. Diseases that live in only cave systems or within a single species. Diseases that were locked away millions of years ago in the now-thawing ice. Diseases that, if given a vector — or a means to travel outside of their little rarefied organic or environmental niches — can wreak untold harm across wide spans of the globe.