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  Norovirus can spread from person to person through infected food or water or contaminated surfaces. The best prevention is proper hand washing, but the virus is so contagious that people can become ill even from contact with viral particles in the air. Not everyone who is exposed to norovirus becomes infected and of those who are infected, not everyone gets sick, says Bernstein. But it nonetheless is very common, and can be serious, particularly for children and older adults.