1. Centers for Disease Control and Prevention: Noroviruses (genus Norovirus, family Caliciviridae)
http://www.cdc.gov/ncidod/dvrd/revb/gastro/norovirus.htm

2. MedicineNet.com – Noroviruses are a group of realted bacteria that cause gasterenteritis.
www.medicinenet.com/norovirus_infection/article.htm

3. Wikipedia – Norovirus classification is based upon numbering genogroups. The number of deaths from norovirus in the US is estimated to be around 300.
www.wikipedia.org/wiki/Norwalk_virus

4. Norovirus Lawyer & Attorney: Marler Clark : Norovirus Blog
www.noroblog.com

5. MDOH – Norovirus Infection (aka Norwalk virus, calicivirus – Learn how to minimize your risk of acquiring norovirus.
http://www.health.state.mn.us/divs/idepc/diseases/norovirus/basics.html

6. FDA – Norovirus
http://www.cfsan.fda.gov/~mow/chap34.html

7. HPA.ORG – Norovirus is the most common cause of infectious gastroenteritis in England. www.hpa.org.uk/infections/topics_az/norovirus/menu.htm

8. Alaska Department of Environmental Conservation, Division of Environmental Health, Food Safety Program.
www.dec.state.ak.us/eh/fss/info/norovirus.htm