Investigation and treatment of ovine psoroptic otoacariasis

James Patrick Crilly, Francesca Nunn, Valentina Busin, Edward J Marr, Amy E Jennings, Stewart T G Burgess, Neil D Sargison

Research output: Contribution to journalArticlepeer-review


BACKGROUND: Psoroptic otoacariasis has been described worldwide and is caused by a mite morphologically indistinguishable from the sheep scab mite Psoroptes ovis. A single treatment of affected sheep with 200 μg/kg of injectable ivermectin is reported to be curative.

CASE REPORT: Psoroptes mites were isolated following treatment with ivermectin, but treatment with moxidectin at 1 mg/kg caused complete cessation of clinical signs. Affected animals were seropositive to Pso o 2 antigen enzyme-linked immunosorbent assay (ELISA) and had serum haptoglobin concentrations that overlapped with those described for field infections of classical sheep scab.

CONCLUSIONS AND CLINICAL IMPORTANCE: Psoroptic otoacariasis is not controlled by single treatments of injectable ivermectin but resolves after a single treatment with injectable moxidectin. Pso o 2 ELISA can detect infection with Psoroptes spp. mites but cannot distinguish between sheep scab and psoroptic otoacariasis.

Original languageEnglish
Pages (from-to)206-e52
JournalVeterinary Dermatology
Issue number3
Early online date18 May 2016
Publication statusPublished - Jun 2016


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