Parapoxvirus Alert - June 2026

The TBA has recently become aware of cases of confirmed Equine Parapoxvirus infection in Ireland. Parapoxvirus ulceration can look similar to Equine Coital Exanthema (EHV-3) lesions and may appear as papules, blisters or ulcers affecting the external genitalia of stallions and mares. Previously, this virus was linked to pastern dermatitis affecting non-Thoroughbreds in Finland and more recently in Sweden, but had not been seen linked to disease transmission through breeding activity.  

In light of these findings, breeders are encouraged to check any mares returning, or originating from Ireland for signs of possible Parapoxvirus infection. If you are at all concerned, please speak to your veterinarian who may forward samples from any suspicious lesions or crusts to the Irish Equine Centre for PCR testing.

Equine Parapoxvirus is easily spread via direct contact with other horses, or contaminated instruments or surfaces and is also zoonotic, so staff should ensure they are wearing appropriate PPE. The recommendations outlined in the HBLB International Codes of Practice for Equine Coital Exanthema should be followed, as these precautions are likely to also be appropriate for Equine Parapoxvirus infection.

Please read this notice from the Irish Equine Centre and Irish Equine Veterinary Association for further information.