RT Book, Section A1 Treanor, John A2 Grippi, Michael A. A2 Antin-Ozerkis, Danielle E. A2 Dela Cruz, Charles S. A2 Kotloff, Robert M. A2 Kotton, Camille Nelson A2 Pack, Allan I. SR Print(0) ID 1195014826 T1 Viral Infections of the Lung and Respiratory Tract T2 Fishman’s Pulmonary Diseases and Disorders, 6e YR 2023 FD 2023 PB McGraw-Hill Education PP New York, NY SN 9781260473988 LK accessmedicine.mhmedical.com/content.aspx?aid=1195014826 RD 2024/03/28 AB Viral infections of the upper and lower airways have a major impact on health. Acute respiratory illnesses, caused largely by viruses, are the most common illness experience for otherwise healthy adults and children. Past data from the National Health Interview Survey suggested that such illnesses are experienced at a rate of 85.6 illnesses per 100 persons per year, and account for 54% of all acute conditions exclusive of injuries.1 A total of 44% of these illnesses require medical attention and result in 287 days of restricted activity, 94.4 days lost from work, and 182 days lost from school per 100 persons per year. Estimates from family-based surveillance suggest that approximately one-fourth of these illnesses result in consultation with a physician. Illness rates for all acute respiratory conditions are highest in young children; children below the age of 9 are estimated to experience between 5 and 9 respiratory illnesses per year, whereas adults experience between 3 and 5 such illnesses.2,3