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However, most antibacterial drugs struggle to penetrate the cell membrane and may be excluded or inactivated within the cell. In a recent study, researchers developed a nanogel coated with polydopamine (PDA) that responds to reactive oxygen species (ROS) and has enhanced adhesion properties. This nanogel encapsulates photosensitized zinc phthalocyanine (ZnPc) and an antibacterial drug, and is further modified with folic acid (FA) for active targeting. The resulting ROS-responsive nanogel, termed PDA@PMAA@ZnPc@DH-FA, can reach temperatures up to 50\u00b0C under near-infrared light, leading to a 72.1% improvement in drug release through increased ROS production. Cell staining confirmed a cell survival rate above 75%, with a low hemolysis rate of only 4.633%, indicating excellent biocompatibility. Furthermore, the study\u2019s results showed that the nanogel exhibited stronger killing effects against Brucella compared to administering the drug alone. Under near-infrared irradiation, the nanogel achieved a bacteriostatic rate of 99.8%. 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