Volume 23, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A female was found in a nodular swelling removed from the wrist of a 48-year-old woman who had not been outside the area of Illinois, Wisconsin, and Missouri. Detailed examination of from man, horse, and cow demonstrated that on the basis of cuticle morphology the worm from the patient was distinguishable from obtained from subcutaneous nodules from man, from the gastrosplenic ligament of cattle, from the ligaments and flexor tendons of the legs of horses, and an species from the stifle joint of cattle. It closely resembled and from the ligamentum nuchae of the cow and horse, respectively. Its location in dense connective tissues possibly favors the likelihood of its being eventually identified as . Neither or has been reported from the immediate locality of the patient's residence but both species probably occur there as do also their respective vectors, and species. Three authentic cases of zoonotic onchocerciasis have been reported previously, one each from Switzerland, Crimea (USSR), and Canada.


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