Why Some Diseases Only Traveled One Direction
CGP GreyYouTube ↗
Further reading 1
Caption notes
Grey separates a rare jump from animals into humans from the conditions that can sustain transmission afterward. He contrasts a small isolated settlement with a city receiving new inhabitants to explain how a chain of infection might continue.
Archived captions (transcription method unspecified) ↗Original passages · 2
In a small, isolated groupmany chances for infection and even then the new-born plague needs a fertile environment