Imagine that the zone you just measured was associated with a
disc containing penicillin and a seeded lawn
of Staphylococcus aureus. Consult table 7-4 in your
lab text and interpret this result:
a.
This strain of S. aureus is susceptible to
penicillin
b.
This strain of S. aureus has intermediate
susceptibility to penicillin
c.
This strain of S. aureus is resistant to
penicillin
To further reinforce the concept that zones must be measured and
interpreted, imagine that you had performed a Kirby-Bauer test in
which ciprofloxacin, penicillin, and tetracycline were evaluated
against a new strain of Staphylococcus aureus. Interestingly, all
three drugs produced identical zones of inhibition with a diameter
of 16 mm. How would you interpret these results?
This strain of S. aureus is/has
________________ to ciprofloxacin.
a.
Resistant
b.
Intermediate susceptibility
c.
Susceptible
This strain of S. aureus is/has
________________ to penicillin.
a.
Resistant
b.
Intermediate susceptibility
c.
Susceptible
his strain of S. aureus is/has
________________ to trimethoprim.
a.
Resistant
Intermediate susceptibility
b.
Intermediate susceptibility
c.
Susceptible