[Epidemiological aspects of Uncinaria stenocephala infections in the Netherlands (author's transl)]

A series of experimental infections in a total number of twenty-two dogs showed that transmission of the parasite Uncinaria stenocephala from one dog to another is readily achieved by oral route. Cutaneous infection was only successful when large doses were used. From the topographical distribution of some intestinal U. stenocephala worm populations in dogs it was concluded that the hookworm population is concentrated in the proximal part of the ileum. The expulsion of worms observed may be evidence of the size or persistence of the worm population. The prepatent period was found to be (at least) thirteen days, both in dogs and in foxes. Daily worm-egg counts showed a fluctuating rhythm, particularly during the first 2-3 weeks of the patent period. Relatively high peaks were also recorded in some cases. The maximum number of worms eggs was estimated at well over 5,000 eggs per female U. stenocephala worm (in dogs). U. stenocephala eggs and larvae are capable of surviving at low temperatures. U. stenocephala infection was found to be present in twenty-five (86 per cent) out of twenty-nine foxes obtained and examined in 1975, the worm load varying from one to 176 hookworms and averaging thirty worms per fox. From the preliminary results of a number of experimental transmissions it was concluded that foxes and dogs harbour adapted strains of U. stenocephala, which prevents cross infections between these reservoirs from occurring to more than a limited extent.