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You are seeing a 10 month old female with profuse projectile vomiting and one episode of diarrheal stool over the last 2 hours. She is ill-appearing and has signs of significant dehydration. While obtaining vascular access and rehydrating her, you obtain additional history and peruse her chart. She has had three prior similar but more mild episodes, all diagnosed as acute gastroenteritis, starting at age 7 months. This episode began ~90 minutes after the family had dinner. The family had peanut chicken curry over rice and a salad. The baby had rice and small pieces of chicken set aside before being mixed with the peanut curry sauce. The baby has a 3-year-old sister in preschool. She is asymptomatic.