Keywords: Diphtheria antitoxin horse.jpeg A horse which was being used to produce diptheria antitoxin http //www fda gov/fdac/features/2006/106_cber html specifically http //www fda gov/fdac/graphics/2006graphics/cber_horse_fda jpg http //web archive org/web/20080725142213/http //www fda gov/fdac/features/2006/106_cber html archive It came from the FDA's website Courtesy of National Archives and Records Administration and was also likely to have been taken before 1923 Public domain Diphtheriahorse jpg PD-USGov Use of horses in human medicine |