TY - CHAP M1 - Book, Section TI - Ectoparasite Infestations and Arthropod Injuries A1 - Pollack, Richard J. A1 - Norton, Scott A. A2 - Jameson, J. Larry A2 - Fauci, Anthony S. A2 - Kasper, Dennis L. A2 - Hauser, Stephen L. A2 - Longo, Dan L. A2 - Loscalzo, Joseph PY - 2018 T2 - Harrison's Principles of Internal Medicine, 20e AB - Ectoparasites include arthropods and creatures from other phyla that infest the skin or hair of animals; the host animals provide them with sustenance and shelter. The ectoparasites may penetrate within or beneath the surface of the host or may attach by mouthparts and specialized claws. These organisms may inflict direct mechanical injury, consume blood or nutrients, induce hypersensitivity reactions, inoculate toxins, transmit pathogens, create openings in the skin for secondary bacterial infection, and incite fear or disgust. Human beings are the sole or obligate hosts for only a few kinds of ectoparasites but serve as facultative, dead-end, or paratenic (accidental) hosts for many others. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/11/14 UR - accesspharmacy.mhmedical.com/content.aspx?aid=1156510719 ER -