Exposure to unclean conditions early in life doesn't affect a child's risk of developing asthma, researchers say.

Exposure to unclean conditions early in life doesn't affect a child's risk of developing asthma, researchers say.
http://www.nlm.nih.gov/medlineplus/news/fullstory_95835.html

"Exposure to unclean conditions early in life doesn't affect a child's risk of developing asthma, researchers say."