Figure 3:

Design criteria for materials to deliver microbe-based therapeutics. Criteria range from the chemistry used to release therapeutics to the target organ system. At the molecular level, both the chemistry used to control the release of the active agent and the selection of polymer matrix are critical. These materials can then be formulated into hydrogels, fibers, or spheres for delivery with input based on the target organ for delivery. Together, these factors enable tunable delivery of therapeutics to different areas of the body.