The plate below is a test of 7 different antibiotics against Enterobacter aerogenes. The center disc is Ciprofloxacin 15 micrograms) and the 24 hour extent of the Zone of Inhibition is the farther diameter. The one below it and slightly to the right is Chloramphenicol (30 micrograms) [see red arrow}. Give me the extent of the Zone of Inhibition in mm (yes, use a ruler and measure it at the size it comes up on your computer screen), then use the Standard Table and determine R, I, S for each.AntibioticZone of Inhibition (mm)R, I or SDrug targetCiprofloxacin Chloramphenicol Which of the 2 drugs is more selective and why? VA2 Inhibitory zone diameter to nearest millimeter (mm)Name of antibiotics (dose)Moderately sensitiveSensitive (S)Resistant (R)(MS)Amoxicillin (30µg/disk)Cloxacillin (5 µg/disk)Cephalothin (30 µg/disk)21814–17<1322522–24S2121815–17S14Cephradine (25 µg/disk)Cefuroxime (30µg/disk)Cefixime (5 µg/disk)21813–17s1222315–22S1421916–18s15Kanamycin (30 µug/disk)Streptomycin (10µg/disk)Neomycin (30 µg/disk)Vancomycin (30 µg/disk)21814–17s1321512–14<1121713–16s1221210–11Erythromycin (15 µg/disk)Azithromycin (15 µg/disk)Ciprofloxacin (15 µg/disk)Levofloxacin (5 µg/disk)22314–22s1321814–17s1322116–20s1521714–16s13Tetracycline (30 µg/disk)21512–14s11Doxycycline (30 µg/disk)21411-13s10Cotrimoxazole (25 µg/disk)21611-15s10Chloramphenicol (30 µg/disk)21813–17<12

Zone of inhibition is area (circular) of an specific antibiotic in which the bacteria growth…

Answered: The plate below is a test of 7…

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The plate below is a test of 7 different antibiotics against Enterobacter aerogenes. The center disc is Ciprofloxacin 15 micrograms) and the 24 hour extent of the Zone of Inhibition is the farther diameter. The one below it and slightly to the right is Chloramphenicol (30 micrograms) [see red arrow}. Give me the extent of the Zone of Inhibition in mm (yes, use a ruler and measure it at the size it comes up on your computer screen), then use the Standard Table and determine R, I, S for each.

Antibiotic	Zone of Inhibition (mm)	R, I or S	Drug target
Ciprofloxacin
Chloramphenicol

Which of the 2 drugs is more selective and why?

Inhibitory zone diameter to nearest millimeter (mm)
Name of antibiotics (dose)
Moderately sensitive
Sensitive (S)
Resistant (R)
(MS)
Amoxicillin (30µg/disk)
Cloxacillin (5 µg/disk)
Cephalothin (30 µg/disk)
218
14–17
<13
225
22–24
S21
218
15–17
S14
Cephradine (25 µg/disk)
Cefuroxime (30µg/disk)
Cefixime (5 µg/disk)
218
13–17
s12
223
15–22
S14
219
16–18
s15
Kanamycin (30 µug/disk)
Streptomycin (10µg/disk)
Neomycin (30 µg/disk)
Vancomycin (30 µg/disk)
218
14–17
s13
215
12–14
<11
217
13–16
s12
212
10–11
Erythromycin (15 µg/disk)
Azithromycin (15 µg/disk)
Ciprofloxacin (15 µg/disk)
Levofloxacin (5 µg/disk)
223
14–22
s13
218
14–17
s13
221
16–20
s15
217
14–16
s13
Tetracycline (30 µg/disk)
215
12–14
s11
Doxycycline (30 µg/disk)
214
11-13
s10
Cotrimoxazole (25 µg/disk)
216
11-15
s10
Chloramphenicol (30 µg/disk)
218
13–17
<12

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