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Norovirus, also known as the “stomach bug,” is a highly contagious virus that causes gastroenteritis, inflammation of the stomach and intestines. It is the most common cause of acute gastroenteritis worldwide, leading to symptoms such as diarrhea, vomiting, nausea, and stomach cramps. Norovirus spreads easily through contaminated food, water, surfaces, and person-to-person contact. While norovirus infections are usually self-limiting and resolve within a few days, they can be severe, especially in young children, the elderly, and individuals with weakened immune systems. Proper hygiene and sanitation are crucial in preventing its spread.