Viral Infection in the Lungs Anatomy
To better understand viral pneumonia, it helps to understand the anatomy of the lungs.
Inside the chest, the windpipe, or trachea, divides into two smaller tubes: the right bronchus and the left bronchus. The right bronchus enters the right lung and the left bronchus enters the left lung. The right bronchus and left bronchus branch into smaller and smaller tubes.
The smallest tubes, called bronchioles, end in tiny air sacs, called alveoli. Blood flows very close to the walls of the alveoli. Oxygen and carbon dioxide pass between the air and the bloodstream through the wall of the alveoli.
- Cheng VC, Tang BS, Wu AK, Chu CM, Yuen KY. Medical treatment of viral pneumonia including SARS in immunocompetent adult. J Infect. 2004 Nov;49(4):262-73. 
- de Roux A, Marcos MA, Garcia E, Mensa J, Ewig S, Lode H, Torres A. Viral community-acquired pneumonia in nonimmunocompromised adults. Chest. 2004 Apr;125(4):1343-51. 
- Pugh RN, Omar RI, Hossain MM. Varicella infection and pneumonia among adults. Int J Infect Dis. 1998 Apr-Jun;2(4):205-10. 
- Virkki R, Juven T, Rikalainen H, Svedstrom E, Mertsola J, Ruuskanen O. Differentiation of bacterial and viral pneumonia in children. Thorax. 2002 May;57(5):438-41.