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In this case report, a previously healthy six-year-old presented with fever and altered mental status, and was found to have bacteremia with Listeria monocytogenes, acquired from premade fish balls. Invasive L. monocytogenes infection usually occurs in immunocompromised or newborns but may occasionally occur in healthy children with food-borne gastroenteritis. L. monocytogenes should be considered in patients with severe infection and symptoms of gastroenteritis, particularly since ceftriaxone, the Danish standard treatment for meningitis in children, does not cover L. monocytogenes.