John Snow, Asiatic Cholera and the inductive-deductive method - republished

Lecture 4: Competing theories on the origin and spread of infectious disease

Last week, we discussed what was known about the spread of Asiatic Cholera, Snow’s observation of the incubation period, and the problems with defining numerators and denominators. In today’s post, we will describe the competing theories on the origin and spread of infectious diseases that existed in Snow’s time. In the next post, we will learn about d…