The researchers wrapped a synthetic polymer called amino ester around E  coli to form a cell capsule  It was then inserted into a protein vaccine against pneumococci  Experiments show that this capsule can passively or actively aim at a special immune cell, it can enhance the human immune response, and has a strong ability to resist pneumococcal diseases
The researchers point out that the capsule vaccine is cheap and easy to use, and that it can trigger a specific immune response and is more efficient and effective than existing vaccines
bacterial capsule may become a new tool for vaccine delivery