Natural infestation of the chewing lice (Werneckiella equi) on horses and treatment with imidacloprid and phoxim.
Infestation with the chewing louse (Werneckiella (Damalinia) equi) can be found on horses world-wide. Louse infestations, including clinical signs of louse-derived dermatitis, are known from Icelandic horses. A clinical field investigation was conducted in Iceland using horses with natural louse infestations to evaluate the efficacy of imidacloprid in a 10% solution in comparison with phoxim in a 0.05% solution. A total of 27 horses received a single imidacloprid treatment using 16 ml of the 10% solution along the mane and on the dorso-lateral trunk. A further 43 horses were treated twice, 14 days apart, with phoxim, using 2 x 50 ml solution applied along the mane and the dorso-lateral trunk. At the final evaluation on day 28, complete control of the lice was obtained for the imidacloprid treated horses and only a single moribund louse was found on two horses treated with phoxim.
Mencke
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N
Animal Health Division, Bayer Health Care AG, 51368 Leverkusen, Germany. norbert.mencke@bayerhealthcare.com
Larsen
K S
KS
Eydal
M
M
Sigurdsson
H
H
D000818:Animals; D006734:Horse Diseases / Q000188:drug therapy* / Q000469:parasitology; D006736:Horses; D007093:Imidazoles / Q000008:administration & dosage / Q000627:therapeutic use*; D007306:Insecticides / Q000008:administration & dosage / Q000627:therapeutic use*; D010373:Lice Infestations / Q000188:drug therapy* / Q000469:parasitology; D000073943:Neonicotinoids; D009574:Nitro Compounds; D009946:Organothiophosphorus Compounds / Q000008:administration & dosage / Q000627:therapeutic use*; D008003:Phthiraptera / Q000187:drug effects*; D016896:Treatment Outcome
D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D009946:Organothiophosphorus Compounds; C082359:imidacloprid; C003135:phoxim