Zone of Inhibition Test (image) Helmholtz Centre for Infection Research Caption Scientists use the zone of inhibition test to study antibiotic resistance of bacteria. The wafers on the culture medium contain an antibiotic that inhibits growth of sensitive bacteria in their vicinity. Credit HZI/Bergmann und Nitsche-Schmitz Usage Restrictions The image may only be used with appropriate credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.