**Aberrent migration of '''intestinal parasites''', including ''[[Ascaris suum]]'' in pigs and ''[[Parascaris equorum]]'' in horses. This occur particularly when worms have been treated with an anthelmintic that causes spasticity of the muscles. | **Aberrent migration of '''intestinal parasites''', including ''[[Ascaris suum]]'' in pigs and ''[[Parascaris equorum]]'' in horses. This occur particularly when worms have been treated with an anthelmintic that causes spasticity of the muscles. |