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== Introduction  ==

== Introduction  ==

''[[Dictyocaulous arnfieldi]]'' is the lungworm of horses. The main source of infection are donkeys as these remain infected for years and contaminate horses' pasture. Infection can cycle in horses.  

''[[Dictyocaulus arnfieldi]]'' is the lungworm of horses. The main source of infection are donkeys as these remain infected for years and contaminate horses' pasture. Infection can cycle in horses.  

The prevalence of lungworm in horses is around 10-20% whereas in donkeys it is 75%. There are very few adult worms or eggs in the faeces in horses, whereas in donkeys there are many of both present. In horses, the period of patency is around 8 months or less, whereas in donkeys it is around 5 years, hence such a problem occurs when donkeys share pasture with horses. Also, clinical signs are rarely seen in donkeys, unlike horses where signs can be much more severe.  

The prevalence of lungworm in horses is around 10-20% whereas in donkeys it is 75%. There are very few adult worms or eggs in the faeces in horses, whereas in donkeys there are many of both present. In horses, the period of patency is around 8 months or less, whereas in donkeys it is around 5 years, hence such a problem occurs when donkeys share pasture with horses. Also, clinical signs are rarely seen in donkeys, unlike horses where signs can be much more severe.

== Clinical Signs  ==

== Clinical Signs  ==