"Level 4 is the highest degree of laboratory containment for isolation and experimentation on microbiological organisms. Level-4 organisms produce lethal illnesses in humans and, for the most part, have no treatment and no prevention. Among the most infamous are Ebola and Lassa." —from Level 4 Virus Hunters of the CDC
 
With the recent outbreaks of Ebola, and its arrival on American shores, more and more people have become aware—and frightened—of this lethal virus. Husband-and-wife team Dr. Joseph B. McCormick and Dr. Susan Fisher-Hoch journey through equatorial Africa, Brazil's ghettos and rainforests, and settlements in northern Pakistan in search of those already infected by these killers. Filled with scientific knowledge, Level 4 explains how and why these viruses are so deadly and how we can prevent further devastating epidemics from breaking out.

JOSEPH B. MCCORMICK, MD, one of the world’s foremost authorities on Ebola and Lassa fever, is also renowned as the first HIV investigator in Africa and the researcher who isolated the oldest HIV strain.
 
Before SUSAN FISHER-HOCH, MD joined the CDC, she did pioneering work on Lassa fever, Legionnaires’ disease, and Ebola.