Table 152 -Which Organism in Table 15

Table 15.2 $\begin{array}{|l|c|}\hline \text { Bacterium } & \text { ID50 } \\\hline \text { E. coli } 0157: \mathrm{H7} & 20 \\\hline \text { Legionella pneumophia } & 1 \\\hline \text { Shigella } & 10 \\\hline \text { Treponema pallidum } & 57 \\\hline\end{array}$
-Which organism in Table 15.2 causes the most severe disease?

A) E. coli O157:H7
B) Treponema pallidum
C) Shigella
D) Legionella pneumophila
E) It cannot be determined from the information provided.