Joseph is a 14 year-old, generally well and up-to-date with health maintenance, who presents for a sick visit, stating, “My stomach has not been right for about 4 days. The illness began with a 36 h hx of gradual onset nausea, vomiting and loose stools, reporting “I’m not sure how many times I threw up or had diarrhea.” He last vomited about 24 h ago, last stool was around 4 h ago, reported as yellow-brown in color, small volume and without blood. He has been tolerating clea...