A thread on why the WHO's resurrection of a need for close contact as a condition for infections to transmit is a relapse into a Medieval model of contagionism long discredited by Koch.
There was an ancient debate over the origin of epidemics between miasmatists (non-contagious bad air arising in the environment) vs contagionists (infectious spread person-to-person). The scientific debate is over, but the political grounds driving the polarisation remain alive today. 🧵
