E. coli-based Transport Capsule for Next-gen Vaccines (image) University at Buffalo Share Print E-Mail Caption The core of the capsule is harmless E. coli. Around the bacteria, the researchers wrapped a synthetic polymer -- called poly (beta amino ester) - like a chain link fence. The positive-charged polymer, combined with the negative-charged bacteria cell wall, create a sort of hybrid capsule. Credit University at Buffalo Usage Restrictions None Share Print E-Mail 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.