This is a virus spread by mosquitos. It commonly causes problems in Summer. Animals that are affected will commonly seek shade and become stiff in the joints. They can become so ill that they won't get up and some animals can die. Most animals that recover from the disease have a long lasting immunity. Animals that are worth considering vaccinating are valuable animals and bulls. Vaccination must be carried out yearly to stay effective.
If animals are affected there are medications that can be used to speed up recover, particularly anti-inflammatories and calcium. These animals should also be protected from the heat and offered food, water and shade. For any cow that goes down, it is ESSENTIAL that the animal is kept sitting on its belly and never allowed to lay out on its side.