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Norovirus is indeed responsible for about 50% of all outbreaks of food-related illnesses. This highly contagious virus can spread easily from person to person and through contaminated food, water, surfaces, and utensils. Its resilience allows it to survive on surfaces for long periods and it can withstand extreme conditions, contributing to its prevalence in foodborne illness outbreaks.

The significance of Norovirus lies in its ability to spread rapidly in environments such as restaurants, cruise ships, and schools, leading to a high number of cases in localized outbreaks. Its quick onset of symptoms, typically 12 to 48 hours after exposure, also contributes to the rapid spread since individuals may not realize they are infected before they can transmit the virus to others.

Other pathogens listed, while they do cause food-related illnesses, do not account for as high a percentage of outbreaks as Norovirus. Understanding the impact of Norovirus on food safety is critical for implementing preventive measures in food handling and preparation practices to mitigate its spread.