RT Book, Section A1 Levinson, Warren A1 Chin-Hong, Peter A1 Joyce, Elizabeth A. A1 Nussbaum, Jesse A1 Schwartz, Brian SR Print(0) ID 1190860640 T1 Gram-Negative Rods Related to the Respiratory Tract 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=1190860640 RD 2024/04/20 AB There are four medically important gram-negative rods typically associated with the respiratory tract, namely, Haemophilus influenzae, Bordetella pertussis, Legionella pneumophila, and Acinetobacter baumannii (Table 19–1). H. influenzae and B. pertussis are found only in humans, whereas L. pneumophila is found primarily in environmental water sources. A. baumannii is found in environmental water sources but also colonizes the skin and upper respiratory tract.