The Hot Zone by Richard Preston.  

A highly infectious, deadly virus from the central African rain forest suddenly appears in the suburbs of Washington, D.C. There is no cure. In a few days 90 percent of its victims are dead. The Hot Zone tells the dramatic story, giving a hair-raising account of the appearance of rare and lethal viruses and the "crashes" into the human race. Stephen King called this story "One of the most horrifying things I've ever read. What a remarkable piece of work."