Gastroenteritis or "food poisoning" is characterized by sudden nausea, vomiting, abdominal cramps, diarrhea, headache chills and fever up to 39 oc. The symptoms can be mild to severe and may last between 5-7 days. Salmonella enterica causes an estimated 1.3 billion cases of gastroenteritis and 3 million deaths annually (l .4 million cases and 600 deaths in the US alone). The infectious dose for S. enterica is 103 bacilli. Infectious dose is the number of organisms you need to enter the body in order to cause disease. This means if the food you eat is contaminated with 1000 cells or greater you risk contracting food poisoning. How many cells of S . ?enterica are predicted to be in 100 ?g of chicken salad after sitting out at 25 C for 3 ?hours?