Table 15.1 $\begin{array}{|l|l|l|}
\hline \text { Bacterium } & \text { Portal of Entry } & \text { ID 50 } \
\hline \text { Stophylococcus aureus } & \text { Wound } &

Question

Table 15.1 $\begin{array}{|l|l|l|}
\hline \text { Bacterium } & \text { Portal of Entry } & \text { ID 50 } \
\hline \text { Stophylococcus aureus } & \text { Wound } & <10 \
\hline \text { Stwohylococcus aureus } & \text { Wound + Ampicillin } & 300 \
\hline
\end{array}$ 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) has no effect on risk of infection.
B) replaces tetracycline.
C) decreases the risk of staphylococcal infection.
D) increases the risk of staphylococcal infection.
E) The answer cannot be determined based on the information provided.

Quizplus · Accepted Answer

The ID50 for Staphylococcus aureus in wounds with ampicillin is 300, which is higher than the ID50 for Staphylococcus aureus in wounds without ampicillin (<10). This indicates that the administration of ampicillin before surgery decreases the risk of staphylococcal infection.

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