Outbreak

Try to remain calm.

A virus similar to Ebola and Lassa is discovered in the African jungles in 1967 and kept top-secret. The discovery is covered up by destroying the mercenary camp where it is discovered with a fuel-air bomb, a specially-designed conventional weapon capable of very high explosive yields.

Twenty-five years later, it resurfaces in Africa again...

A deadly virus is carried by a monkey host from the African rainforest to a small town in Northern California, where it quickly begins infecting the entire population. When the Centers for Disease Control and Prevention  is unable to treat it, the resources of the US military, including the United States Army Medical Research Institute for Infectious Diseases, are called upon to contain it by any means necessary.