I'm posting this because so many people have questions about noro and sometimes inaccurate advice and info is given. Everything you want to know about Norovirus can be found here and it is ACCURATE information http://www.cdc.gov/norovirus/index.html
Use a chlorine bleach solution with a concentration of 1000–5000 ppm (5–25 tablespoons of household bleach [5.25%] per gallon of water) or other disinfectant registered as effective against norovirus by the Environmental Protection Agency (EPA). For more information, see EPA’s Registered Antimicrobial Products Effective Against Norovirus (Norwalk-like virus) .