"Media of contagion"

(15 October 1844)

See the article on medium of contagion regarding possible context for Snow's argument about the likely mode of communication of cholera in the opening part of MCC (1849). After rejecting infection of the blood via the lungs, he substitutes instead another "ancient" portal of entry, oral to the stomach; and argues analogically from affections caused by ova of [parasitical] intestinal worms.]