In a deviation from standard posts, I turn to the current outbreak of the Ebola virus in West Africa. The infographic from Forbes below may shed some light on the relative extent and virulence of this outbreak.
EBOLA VIRUS DISEASE: VIRULENCE PER OUTBREAK. Rectangles are outbreaks, labelled with year. Size is number of disease cases. Color is virulence, the case fatality rate from 0% yellow to red 100%. (Data: WHO / CC BY: JV Chamary / Source)
This short story has nothing to do with Ebola, but if you want to see how a very common pathogen can be use for germ-warfare, then read Cohesion Lost.