We are starting to see cases of red-worm disease this year; early signs can be subtle and easily attributed to less serious conditions, until a sudden onset of life-threatening disease can occur, which is deadly in up to 50% of horses.
High redworm burdens can cause symptoms including gradual weight loss, colic, diarrhoea, and general poor condition. Sudden re-emergence of large numbers (i.e. several million parasites) causes severe symptoms such as serious colitis (diarrhoea which leads to dehydration), sudden weight loss, oedema (swelling under belly/sheath/legs)
Every year we see horses die from redworm, even though owners believe they have wormed adequately. So why are we still seeing significant disease?
MOXIDECTIN is the only wormer that effectively treats encysted (hibernating) redworm, and we recommend giving it to healthy adult horses, at the correct dose, in late Autumn-Winter before any encysted larvae emerge. Ivermectin & Pyrantel are not effective treatments.
WORM EGG COUNTS (WEC) DO NOT MEASURE WORM BURDEN. They measure an individual’s contribution to pasture-contamination and are a way of managing wormer-resistance. They identify low egg-shedders which are left untreated, allowing eggs that have not been exposed to wormer selection-pressure to dilute resistant worms on pasture.
WORM EGG COUNTS DO NOT