(EHV-1, EHV-2, EHV-3, EHV-4
There are nine types of Equine Herpesvirus. EHV-1
and EHV-4 are of most significance, EHV-3 is of less significance, and
EHV-2 and EHV-5 are clinically insignificant. Equine herpesvirus
1,3 and 4 belong to the sub-family Alphaherpesvirinae,
herpesvirus 2 and 5 belong to the sub-family Gammaherpesvirinae.