Bronchiolitis is a common lung infection that typically affects infants under 1 year old. It is caused by respiratory syncytial virus (RSV) in most cases. Symptoms include a runny nose, cough, wheezing and difficulty breathing. There is no specific treatment for bronchiolitis other than supportive care, with most cases resolving on their own within 2 weeks.

3. Sources
"Bronchiolitis." HealthyChildren.org. Web. Mar. 2014.
<http://www.healthychildren.org/English/health-
issues/conditions/chest-
lungs/Pages/Bronchiolitis.aspx>.
"Bronchiolitis." : Types, Causes & Symptoms. N.p., n.d.
Web.
<http://www.healthline.com/health/bronchiolitis#Causes
>.
Zaghloul, Dr.mona Z. "Respiratory Syncytial Virus
Infection in Children." American Family Physician 83.02
(2011): 141-46. Web.