Editing Pneumonia (section)

===Viral===
Viruses may reach the lung by a number of different routes. Respiratory syncytial virus is typically contracted when people touch contaminated objects and then touch their eyes or nose.<ref name=M31>Murray and Nadel (2010). Chapter 31.</ref> Other viral infections occur when contaminated airborne droplets are inhaled through the nose or mouth.<ref name=Clinic2011/> Once in the upper airway, the viruses may make their way into the lungs, where they invade the cells lining the airways, alveoli, or [[lung parenchyma]].<ref name=M31/> Some viruses such as measles and herpes simplex may reach the lungs via the blood.<ref name=Gary2010>{{cite book|editor-last1=Fleisher|editor-first1=Gary R.|editor-last2=Ludwig|editor-first2=Stephen |title=Textbook of pediatric emergency medicine|year=2010|publisher=Wolters Kluwer/Lippincott Williams & Wilkins Health|location=Philadelphia|isbn=978-1-60547-159-4|page=914|url=https://books.google.com/books?id=a7CqcE1ZrFkC&pg=PA914|edition=6th}}</ref> The invasion of the lungs may lead to varying degrees of cell death.<ref name=M31/> When the immune system responds to the infection, even more lung damage may occur.<ref name=M31/> Primarily white blood cells, mainly [[mononuclear cell]]s, generate the inflammation.<ref name=Gary2010/> As well as damaging the lungs, many viruses simultaneously affect other [[organ (anatomy)|organs]] and thus disrupt other body functions. Viruses also make the body more susceptible to bacterial infections; in this way, bacterial pneumonia can occur at the same time as viral pneumonia.<ref name=Viral09>{{cite journal | vauthors = Figueiredo LT | title = Viral pneumonia: epidemiological, clinical, pathophysiological and therapeutic aspects | journal = Jornal Brasileiro de Pneumologia | volume = 35 | issue = 9 | pages = 899–906 | date = September 2009 | pmid = 19820817 | doi = 10.1590/S1806-37132009000900012 | doi-access = free }}</ref>