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Hogweed suspected of causing primary photosensitisation in a horse
  1. Philip Ivens
  1. Buckingham Equine Medicine Referrals, Overton Fields, Towcester Road, Maid's Moreton, Buckingham MK18 1RE

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I WOULD like to report an unusual case of probable primary photosensitisation in a horse from hogweed (Heracleum sphondylium) and ask whether any colleagues have come across similar cases.

A 12-year-old chestnut pony mare presented in the autumn of 2010 with a crusting dermatosis restricted to the unpigmented lower lip and lower muzzle, continuing caudally into the lower half of the white blaze, consistent with photosensitisation. The pony …

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