Stomach Bug 2024 Lasting A Long Time In Usa. Symptoms usually appear one to three days after exposure to viral gastroenteritis. The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite.
Norovirus is one tough virus โ able to survive for weeks outside of the. Once symptoms appear, they usually last for 1 to 2 days, although symptoms may linger for as long as 10 days.
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