Reasoning for Differential Diagnoses Elimination

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Differential Diagnosis Symptoms/Possible Elimination (when applicable)
E. coli infection Has fever, loss of appetite, stomach cramping
BUT vomiting is rare
Has bloody urine, bruising  (not present in outbreak disease)
Cholera Has abdominal cramps, excessive thirst, low urine output, nausea, vomiting, watery diarrhea, dehydration, rapid pulse, dry skin
Possible diagnosis
Amebic dysentery (amebiasis) Has abdominal cramps, diarrhea
BUT only severe cases have fever, vomiting, and bloody stools
Could reasonably be a possible diagnosis
Giardiasis Has diarrhea, abdominal gas or bloating, nausea, weight loss
BUT no vomiting and only low-grade fever
Food poisoning Can have vomiting and diarrhea
BUT not reasonable that thousands of people across a distance eat the same bad food
Ascariasis Has stomach pain
BUT has low-grade fever, skin rash, vomiting worms, worms leaving body through nose or mouth, cough, bloody sputum (respiratory mucus)-  all of which are all not present in outbreak disease
Trichinosis Has abdominal discomfort, cramping, fever, and diarrhea
Also has facial swelling around the eyes, muscle pain especially with breathing or chewing (not present in outbreak disease)BUT no vomiting
Leishmaniasis Has fever, vomiting and diarrhea
BUT has skin sores, stuffy nose,  runny nose, swallowing difficulty or ulcers in mouth, tongue, gums, lips (not present in outbreak disease)