The common practice of adding medications to animal feed results in exposing the handlers of such products to many potential cutaneous sensitizers. Two cases of contact dermatitis occurred from exposure to antibiotics via this route. Tylosin was the sensitizing agent in one case and deserves special mention because it is one of the few antibiotics restricted to veterinary use.
Neldner KH. Contact Dermatitis From Animal Feed Additives. Arch Dermatol. 1972;106(5):722-723. doi:10.1001/archderm.1972.01620140066020