Arthropods

Foreyt et al. (1992) found 200 | g kg-1 of ivermectin administered sub-cutaneously plus two drops of ivermectin diluted in saline (no specifics provided) administered topically in each ear was an effective treatment for Psoroptes spp. in llamas based on the absence of mites at 3 weeks post-treatment. Against sarcoptic mange, 200 | g kg-1 of ivermectin given subcutaneously once (Kuntze and Kuntze, 1991) or twice at a 10-14 day interval was effective (Kress, 1983). Ivermectin in the injectable formulation was not effective against Chorioptes spp. in llamas (Long, as reported by Rickard, 1994), and Johnson (1994) suggested that 400 |g kg-1 of ivermectin administered subcutaneously may be needed to elicit an effective result for chorioptic mange.

Larvae and nymphs of the spinose ear tick (Otobius megnini) can be treated effectively with ivermectin, administered subcutaneously at

200 | g kg-1 (Fowler, 1989). This same treatment was found to be effective against sucking lice (Microthoracius spp.) but not biting lice (Damalinia breviceps) by Fowler (1986).

Fowler and Paul-Murphy (1985) observed resolution of clinical signs associated with a nasopharygeal bot of the genus Cephenemyia following subcutaneous treatment with 200 | g kg-1 of ivermectin.

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