Efficacy of moxidectin oral gel against Onchocerca cervicalis microfilariae.

The research article discusses the successful use of moxidectin oral gel in eliminating a type of parasite, Onchocerca cervicalis, in ponies. The treatment was found to be completely effective and had no adverse effects.

Research Context

• The research was initiated as a part of dose-titration experiments conducted to assess the effectiveness of moxidectin oral gel against equine gastrointestinal parasites.
• In the process, the researchers identified that 25 out of 82 ponies were infected with another parasite – Onchocerca cervicalis. The infection was diagnosed through the detection of microfilariae in full-thickness skin biopsies taken from the ventral midline, a location on the pony’s body.

Research Findings

• The researchers treated infected ponies with single doses of moxidectin at different concentrations – 300, 400, or 500 micrograms/kg of body weight.
• Post 14 days of this treatment, the researchers again took 20 skin biopsies from the ponies. It was observed that the treatment was 100% effective since the microfilariae were completely eliminated from these 20 skin biopsies.
• Meanwhile, there were 5 ponies in 2 control groups who were given placebo treatment. These ponies also had microfilaria initially, and post the placebo treatment, they continued to stay microfilaria-positive, implying the placebo had no effect on the parasite.

Reaction to the Drug

• In terms of the effect of the drug, moxidectin oral gel was found to be completely safe. None of the ponies displayed any adverse reaction following the treatment with moxidectin or the vehicle control (placebo).

Implications of the Findings

• The research establishes moxidectin oral gel as an effective and safe treatment for Onchocerca cervicalis infection in ponies.
• These findings open the way for further exploration of the utility of moxidectin in treating other parasitic infections in equines as well as in other animals.