Worldwide, there are nine identified equine herpes viruses (EHV) with five strains causing disease in the UK horse population. The two most common types are EHV-1 which causes respiratory infection; abortion; neonatal death and neurological disease (Equine Herpes Myeloencephalopathy or EHM) and EHV-4 which usually only causes low grade respiratory infection but occasionally can cause...Continue Reading