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Antibiotic sensitivity testing

This photo shows a nutrient agar plate on which a culture of the bacterium E. coli has been spread, and a ring of paper disks (coloured) which have been impregnated with a variety of commonly used antibiotics, according to the codes below the picture.
Roll your mouse pointer over, or tap the image to see an explanation.
Antibiotic sensitivity test plate

PG Penicillin G
S Streptomycin*
T Tetracycline*
C Chloramphenicol*
E Erythromycin
FC Fucidic acid
MT Metronidazole
NO Novobiocin

It can be seen that only the 3 antibiotics marked * are effective against this bacterial strain, and that it is resistant to the others.


This file is accessible from the BioTopics unit Testing bacteria for sensitivity to antibiotics

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