Table 151 Table 151 Shows the ID₅₀ for Staphylococcus Aureus in Wounds with |

Multiple Choice

Table 15.1 $$\begin{array} { | l | l | l | } \hline \text { Bacterium } & \text { Portal of Entry } & \text { D50 } \\\hline \text { Staphylococcus aureus } & \text { Wound } & < 10 \\\hline \text { Staphylococcus aureus } & \text { Wound + Ampicillin } & 300 \\\hline\end{array}$$
Table 15.1 shows the ID₅₀ for Staphylococcus aureus in wounds with and without the administration of ampicillin before surgery.Based on the data,the administration of ampicillin before surgery

A) decreases the risk of staphylococcal infection.
B) increases the risk of staphylococcal infection.
C) has no effect on risk of infection.
D) replaces tetracycline.
E) The answer cannot be determined based on the information provided.