During a local discussion of human papillomavirus (HPV), mention was made of the association of HPV-7 with butcher's warts, an association that has appeared on numerous in-service and certification examinations of the American Board of Dermatology. Residents have developed tortuous mnemonics to remember this connection, eg, "butcher has 7 letters," or "7 looks like a meat cleaver." This time, in conference, the resident's question was, "Are we saying that butcher's catch HPV-7 from the meat?" When none of the staff physicians had the answer, we looked into the history of this association and found that "what everybody knows" may be wrong.
Meffert JJ, Anthony JS. Butcher's Warts: Dermatological Heritage or Testable Misinformation?. Arch Dermatol. 2001;137(3):384-385. doi: