Zones of Inhibition in Antibiotic Tests Flashcards

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In an antibiotic disc test, what is a zone of inhibition?

It is the clear area around an antibiotic disc where bacteria do not grow.

It shows that the antibiotic has killed the bacteria or stopped them growing there.

The antibiotic diffuses out into the jelly and kills or stops nearby bacteria, leaving a clear circle.

A larger zone usually means the antibiotic is more effective against that type of bacteria.

It suggests the bacteria are not affected by that antibiotic, so they may be resistant.

They measure the diameter to compare how effective different antibiotics are on the same bacteria.

The diameter is usually measured in millimetres (mm).

You compare the diameters of their clear zones; the one with the bigger zone is usually more effective.

So that only the antibiotic changes, making the comparison between zones fair and accurate.

It tells you the antibiotic works, but is less effective than one that makes a larger clear zone.