ACUTE INFECTIONS. “During acute infection, both the host and virus change continuously until infection is resolved, kills the host, or becomes chronic. Certain genes in a virus or in the immune system are niche specific in that they function during acute but not chronic infection. Failure of these immune system genes to function effectively or too-effective evasion of immunity by viral genes can have devastating consequences.”
http://www.sciencedirect.com/science/article/pii/S0092867409007831