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Results gentamycin penicillin Tetra polymixin Nalidixid cycline acid PAN SA Sulfa drug (sulfonamide)

Which antibiotic(s) is/are the most effective? Which antibiotic(s) is/are the least effective? The bacteria used was E.coli and the antibiotics are shown in the diagram on the right.  

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Answer #1

Remember that in the disk test, the most important observation is the size of the halo around the disk (which contains the antibiotic). In this way, a bigger halo is a positive result, while a small halo represent a poor action against the bacteria. As you can see, sulfonamide is the most effective because it produced the highest inhibition around the disk while the least effective is polymyxin.

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