“Lassa is a Level 4 virus from West Africa, and it was one of Peter Jahrling’s favorite life forms-he thought it was fascinating and beautiful, in certain ways. He had held in his gloved hands virtually every hot agent known, except for Ebola and Marburg. When people asked him why he didn’t work with them, he replied, “I don’t particularly feel like dying.” Richard Preston traces the known paths of Ebola and Marburg in The Hot Zone. He tells of their discovery, effects, and the outbreaks. Level 4 scientists for the Army, the CD ....