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Zones of inhibition of bacteria (Staphylococcus aureus) due to the presence of coins. (A) Zone of inhibition around a 12 × 1 mm disk of a UK 5 pence coin (disk is still present in picture); (B) The coins were placed on the bacterial growth media at various times before the bacteria were applied. □ old Dutch bronze one cent coins; ● Australian twenty cent coins; ○ Australian one dollar coins. (n = 6).
