[Preliminary results of a study on the effect of a contagious foot-rot vaccine in sheep (author's transl)].

A large number of findings on the effects of a contagious foot-rot vaccine have been reported in the literature. To gain a personal understanding of the uses of this vaccine, also in view of foot-rot control as prescribed by law in the Netherlands, the course run by an experimentally induced infection was observed in a flock consisting of vaccinated and non-vaccinated animals. A first impression is that the results may be described as encouraging, in accordance with the findings reported in the literature. The comparative part of the trial having been completed, the studies were continued to see whether vaccination might possibly have a long-term cumulative effect. The motivation and planning of these continued studies will be considered in the discussion of the preliminary results. A report will follow later on.