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. 2025 Mar 24;12(1):252–259. doi: 10.5455/javar.2025.l892

Table 2. Determination of the diameter of the ZOI of Staphylococcus aureus isolated from cow milk.

S. No. Antibiotics Abbreviations Disc Conc. Diameter of Zone of inhibition (ZOI) in mm
Resistant Intermediate Susceptible
1. Penicillin P 10IU ≤ 20a 21–28a ≥ 29a
2. Oxytetracycline OT 30 µg ≤ 14e 15–18d ≥19e
3. Chloramphenicol C 30 µg ≤ 12f 13–17e ≥ 18f
4. Gentamycin CN 10 µg ≤ 12f 13–14f ≥ 15h
5. Bacitracin B 10U ≤ 8i 9–11j ≥ 13j
6. Ampicillin AM 10 mcg ≤ 11g 12–13h ≥ 14i
7. Streptomycin S 10 µg ≤ 11g 12–14g ≥ 15h
8. Amoxicillin AX 25 mcg ≤ 19b NIL ≥ 20d
9. Carbenicillin CAR 100 µg ≤ 17c 18–22b ≥ 23b
10. Ciprofloxacin CIP 5 µg ≤ 15d 16–20c ≥ 21c
11. Trimethoprim-Sulphamethoxazole SXT 25 µg ≤ 10h 11–15i ≥ 16g
12. Cefotaxime CTX 30 µg ≤ 14e 15–17d ≥ 18f

Note: Superscript shows the highest and lowest ZOI values.