Bovine and equine onchocerciasis in eastern North America with a discussion on cuticular morphology of Onchocerca spp. in cattle.

Skin sections and/or the ligamentum nuchae and ligamentum gastrolienale were examined from twelve bovine carcasses obtained from southern and eastern Ontario and from Quebec. Of these, seven were shown to be infected with Onchocerca gutturosa and/or Onchocerca lienalis. The morphology of the adult female cuticle is discussed. Skin sections from 43 equine carcasses from a slaughter house in Grenville, Quebec were examined and microfilariae of Onchocerca sp. were recovered from 32 (74%). There are probably referable to Onchocerca cervicalis.