Amoeba (IMAGE) University of Vienna Caption Parachlamydia are widespread in the environment where they live in amoebae. The bacteria serve as a model system for studying the evolution of infectivity. The image shows two amoeba cells in pink that are infected with Parachlamydia (yellow/blue). Credit © Patrick Arthofer 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.