Uploaded November 2025 | Updated September 2026, 2 weeks ago

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Blackleg, also known as Quarter Evil, is a severe necrotizing bacterial infection that commonly afflicts cattle, sheep, and other livestock. This kit, sold by Parke-Davis of Detroit in the 1910s and 20s, was designed to deliver proprietary "blacklegoids" solid vaccine pellets to protect against this disease.

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0:00 Introduction
0:36 Blackleg Pathology
3:07 Blackleg Aggressin
4:35 Blacklegoid Injectors
6:05 Immunization Procedure
7:36 Documentation
10:15 Outro

SOURCES

collections.nlm.nih.gov/bookviewer?PID=nlm:nlmuid-9703539-bk
fontainesauction.com/auction-lot/parke-davis-co.-blacklegoids-cardboard-adver_FCE41C4BEC
abebooks.com/Bath-Tub-Pigs-Parke-Davis-Detroit/31423180692/bd#&gid=1&pid=3
pmc.ncbi.nlm.nih.gov/articles/PMC10886055