Figure 1 (IMAGE) Universitat Pompeu Fabra - Barcelona Caption Counterintuitively, the researchers observed that when the two species of bacteria coexist, their response to the antibiotic is opposite to when they are alone. Credit Image author: Letícia Galera-Laporta. Usage Restrictions None License Licensed 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.