World map of resistence genes (IMAGE) Technical University of Denmark Caption The world map shows the occurrence of resistance genes in different countries. The darker a colour used for a country, the higher the frequency of resistance genes in bacteria. Grey countries have not provided sewage samples. Credit Technical University of Denmark Usage Restrictions May be reproduced if Technical University of Denmark is credited. License Original content 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.