preventative control measures are required - bans on movements of all susceptible animals;
protection against vectors; slaughter or immediate isolation of sick animals; mandatory
& immediate vaccination of the entire equine population with the appropriate serotype;
monitoring for the presence of the virus and the vector. Protection zones (where animals
are vaccinated to contain the spread of the disease) and Surveillance zones (no
vaccination but animals monitored for disease) are set up around outbreaks.