smallpox vaccine

A young calf has his belly shaved. Many slashes are made in the skin. A prior batch of smallpox vaccine is dropped into the slashes and allowed to fester over a period of days. During this period of time, the calf stands in a head stall so that he can’t lick his belly. The calf is led out of the stock to a table where he is strapped down. His belly scabs and pus are scraped off and ground into a powder. The powder is the next batch of smallpox vaccine.