[Survey of the incidence of Dictyocaulus arnfieldi infections in donkeys in the Netherlands (author's transl)].

The results of an investigation into the incidence of Dictyocaulus arnfieldi in donkeys in the Netherlands show that 51 per cent excrete larvae in the faeces. This infection was not detected in animals under five months. The proportion of infected animals did not increase with age. However, the level of excretion was found to increase with age. There was no correlation between the excretion of lungworm larvae and pulmonary symptoms.