1. Food Safety Research Information Office: Norwalk Virus Resource List
Norwalk Virus Gastroenteritis: Norwalk virus and other Caliciviruses. Calicivirus Emergence from Ocean Reservoirs: Understanding Waterborne Caliciviruses, Noroviruses, etc. / Pathogens and Contaminants.
http://fsrio.nal.usda.gov/document_reslist.php?product_id=141

2. Norwalk virus - Health Encyclopedia -- Health >> Medical Questions, Weight Loss, Pregnancy, Drugs...
, Norwalk gastroenteritis. Norwalk virus is a significant cause of gastroenteritis outbreaks in schools, day-cares, summer camps, restaurants, and cruise ships. The Norwalk virus family Norwalk virus is the prototype of a family of unclassified...
http://www.steadyhealth.com/encyclopedia/Norwalk_virus

3. Gastroenteritis & Children
Foods that are new to a young child sometimes trigger bouts of gastroenteritis, and breastfeeding mothers sometimes eat foods that cause gastroenteritis when passed through breast milk to their child.
http://yourtotalhealth.ivillage.com/gastroenteritis-children.html?pageNum=3