Researchers wrapped an artificial polymer called amino esters around E. coli to form a "cell capsule. " They then inserted it into a protein vaccine against pneumococcus. Experiments have shown that the capsule can be passive or active It targets a special immune cell that can boost the body's immune response and has a strong ability to fight pneumococcal disease. Researchers have pointed out that this capsule vaccine is low cost and easy to use, and delivering the vaccine with this capsule can trigger specific immunity The response is more efficient and effective than existing vaccination. According to this text, the following statements are true:. ['"Bacteria capsule" core is amino ester artificial synthetic polymer.', "Harmless E. coli can boost the body's immune response.", '"Bacteria capsules" have outstanding effects on the treatment of lung diseases.', '"Bacteria capsules" or become a new vaccine delivery tool.']