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The transmission of bovine Onchocerca spp. in the UK was investigated by studying the Ceratopogonidae and Simuliidae which attacked bait cattle between April and October at 2 sites in North Wales, where either Onchocerca lienalis and O. gutturosa (Cynwyd), or O. lienalis (Pentrefoelas) alone...

McCall, P. J.; Trees, A. J.
Journal of Helminthology, 1993, 67, 2, pp 123-135