This article has been edited and approved by
Karen Coumbe MRCVS , H&H’s veterinary advisor since 1991.
Ringworm in horses is a highly contagious fungal infection of the skin that can spread rapidly from horse to horse, or from horse to human. Confusingly, despite the name, ringworm is not always ring-shaped and has nothing to do with worms. The Trichophyton spp. and Microsporum spp fungi that cause the disease flourish in wet British winter weather. They grow across the surface of the skin and around the hairs, producing a variety of changes affecting the horse’s coat and skin.
Ringworm in horses: Signs | Is it serious? | What to do | Diagnosis | Treatment | Prognosis
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"}
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MA VetMB CertEP CertVA MRCVS
Our equine veterinary expert has more than 30 years experience in practice. She is an FEI vet and has attended the past three Olympic and two World Equestrian Games in her role. She has a particular interest in anaesthesia, pre-purchase examinations, ophthalmology and dermatology amongst other clinical concerns. She has been Horse & Hound’s official veterinary advisor since 1991. Karen is part of the Bell Equine team.
