RT Book, Section A1 Levinson, Warren A1 Chin-Hong, Peter A1 Joyce, Elizabeth A. A1 Nussbaum, Jesse A1 Schwartz, Brian SR Print(0) ID 1190859267 T1 Pathogenesis T2 Review of Medical Microbiology & Immunology: A Guide to Clinical Infectious Diseases, 17e YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781264267088 LK accessmedicine.mhmedical.com/content.aspx?aid=1190859267 RD 2024/03/28 AB A microorganism is a pathogen if it is capable of causing disease; however, some organisms are highly pathogenic (i.e., they often cause disease), whereas others cause disease rarely. Opportunistic pathogens are those that rarely, if ever, cause disease in immunocompetent people but can cause serious infection in patients with reduced host defenses (immunocompromised).