Survey for infection with Onchocerca cervicalis in horses in eastern United States.

The research focuses on investigating how widespread the infection of Onchocerca cervicalis (a type of parasite) is among horses in the eastern United States.

Research Objective

• The main objective of the study was to carry out a survey to ascertain the prevalence of infection with Onchocerca cervicalis (a parasitic worm) in horses in the eastern area of the United States. The researchers took samples from different animals including horses, a mule, and a donkey.

Research Methodology

• The survey involved examination of 123 animals (comprising 121 horses, 1 mule and 1 donkey) for microfilariae, which are the larval stage of the parasite.
• Three different tests were conducted, checking for the presence of the parasite in the umbilical area, in the eyelid and in the eye of the horse.

Research Findings

• Out of the total animals tested, microfilariae were found in 74 horses, representing a prevalence rate of 61%. This shows that a significant amount of horses in the region are infected with the parasite.
• All the infected horses had the microfilariae of O cervicalis in the umbilical sample.
• Further, 62 horses (84% of the infected horses) showed evidence of the infection in the eyelid.
• The researchers also found that microfilariae had invaded the eyes of 36 horses, which represents 49% of the infected sample group.
• The mule tested in the study was found to be uninfected, while the donkey was reported to have the O. cervicalis infection.

Overall Summary

• The study revealed a high prevalence of Onchocerca cervicalis infection in horses in the surveyed region of the eastern United States. It thus underscores the importance for vets and horse owners in these regions to be vigilant about this parasitic infection.