RT Book, Section A1 Levinson, Warren A1 Chin-Hong, Peter A1 Joyce, Elizabeth A. A1 Nussbaum, Jesse A1 Schwartz, Brian SR Print(0) ID 1176200364 T1 Innate Immunity T2 Review of Medical Microbiology & Immunology: A Guide to Clinical Infectious Diseases, 16e YR 2020 FD 2020 PB McGraw Hill PP New York, NY SN 9781260116717 LK accessmedicine.mhmedical.com/content.aspx?aid=1176200364 RD 2024/04/19 AB The innate immune system is composed of physical barriers, cells, and circulating factors that are always active and ready to repel microbes. They form a boundary between your tissues and the vast majority of viruses, bacteria, and fungi that live on and inside you. Innate immune cells are also important for cleaning up debris from dying cells and repairing damaged tissues.