Atlas of livestock parasites
digitized collection of microscopical preparations

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Dictyocaulus arnfieldi



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Lungworms (Dictyocaulus arnfieldi) are more commonly found in donkeys and

mules than in horses. Lungworms lay eggs that are coughed up and pass out of the gastrointestinal

tract as embryonated eggs in the

feces. The eggs hatch soon after passing and

the larvae develop into an infective freeliving

stage outside of the animals; move

onto the vegetation with the aid of moisture

(rainfall) to re-infect the horse. Young

horses are somewhat more susceptible to

this parasite than older animals and can

show signs of respiratory stress which don’t

usually occur until two weeks after the onset of the infection.


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