title: Sarcoptes scabiei var. canis refractory to ivermectin treatment in two dogs.
abstract: A 10-year-old castrated male Shih Tzu presented with severe generalized pruritus. Skin scrapings revealed the presence of Sarcoptes scabiei var. canis. A Yorkshire terrier in the same household simultaneously developed pruritus due to scabies. Both dogs were treated with 300 μg/kg ivermectin, at first orally and then subcutaneously at 14 day intervals. However, live mites were still found on day 35, and the skin condition deteriorated in both dogs. These findings suggested that the S. scabiei in these dogs was clinically refractory to ivermectin. The pruritus in both dogs rapidly and completely disappeared following topical fipronil administration. This appears to be the first report of canine scabies refractory to ivermectin treatment.
authors.affiliation: Animal Dermatology Center, ASC, Tokyo, Japan Ikemura Pet Clinic, Tokyo, Japan. terayuri@asc.jp
authors.forename: Yuri
authors.initials: Y
authors.lastname: Terada
authors.forename: Nobuo
authors.initials: N
authors.lastname: Murayama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ikemura
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Morita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Nagata
mesh_terms: D000818:Animals; D000977:Antiparasitic Agents / Q000627:therapeutic use*; D004283:Dog Diseases / Q000188:drug therapy / Q000469:parasitology*; D004285:Dogs; D004351:Drug Resistance; D007559:Ivermectin / Q000627:therapeutic use*; D008297:Male; D011720:Pyrazoles / Q000627:therapeutic use; D012520:Sarcoptes scabiei / Q000187:drug effects*; D012532:Scabies / Q000188:drug therapy / Q000469:parasitology / Q000662:veterinary*
chemical_list: D000977:Antiparasitic Agents; D011720:Pyrazoles; D007559:Ivermectin; C082360:fipronil