Donkeys can carry subclinical infections of the lungworm
Dictyocaulus arnfieldi, and horses may become infected
when grazing pasture that has been contaminated. In horses,
lungworm infections rarely reach patency but may induce a
clinical disease characterised by chronic coughing. Treatment
with ivermectin, moxidectin, or some benzimidazoles
is effective in eliminating the infection.
In the UK, further information on control of respiratory
infections is provided in the National Trainers Federation
Code of practice for respiratory diseases affecting horses
and the Horserace Betting Levy Board Guidelines on
strangles.