Encysted small redworm can remain dormant inside a horse for up to 2 years, but usually develop and emerge from the gut wall all at the same time in the early spring. In severe infestations mass emergence can lead to a disease syndrome known as “Larval cyathostominosis” causing diarrhoea and colic with up to a 50% mortality rate3.
2 Dowdall S. et al (2002) Veterinary Parasitology 106, 225-242
3 McWilliam H. et al (2010) International Journal for Parasitology 40, 265-275
4 Matthews JB (2008) An update on cyathostomins: Anthelmintic resistance and worm control. Equine Vet. Education 20 552-560