Vaccinestammen er et rekombinant herpesvirus fra kalkuner (HVT), der udviser beskyttende antigen (VP2) over for stammen Faragher 52/ 70 fra infektiøs bursal sygdom virus (IBDV).
The vaccine strain is a recombinant Herpesvirus of turkeys (HVT) expressing the protective antigen (VP2) of the Infectious Bursal Disease Virus (IBDV) strain Faragher 52/ 70.