Some equine diseases, although relatively rare in the UK, must by law be reported to the local Animal Health Office this is to ensure that the diseases aren't introduced into the UK.
Equine Infectious Anaemia (EIA)
Equine Viral Arteritis (EVA)
Contagious Equine Metritis (CEM)
African Horse Sickness (AHS)
Equine Viral Encephalomyelitis (EVE, EEE, WEE, VEE)
West Nile Virus (WNV)
Glanders / Farcy