Differential Diagnosis for Diarrhea after Consuming Half-Cooked Burger

Single Most Likely Diagnosis

• Food Poisoning (Bacterial): This is the most likely diagnosis given the history of consuming a half-cooked burger, which is a common source of bacterial contamination, such as E. coli or Salmonella. The symptoms of diarrhea and abdominal cramping without fever are consistent with this diagnosis.

Other Likely Diagnoses

• Viral Gastroenteritis: Although less likely than bacterial food poisoning given the specific food history, viral gastroenteritis can cause similar symptoms and should be considered, especially if the onset is more rapid.
• Irritable Bowel Syndrome (IBS): If the symptoms persist beyond the expected recovery time for food poisoning, IBS could be a consideration, especially if there's a history of similar episodes or other IBS symptoms.
• Giardiasis: This parasitic infection can cause prolonged diarrhea and is a consideration if the patient has been exposed to contaminated water or has recently traveled.

Do Not Miss Diagnoses

• Hemolytic Uremic Syndrome (HUS): Caused by E. coli O157:H7, HUS is a potentially life-threatening condition that can arise from food poisoning. It's crucial to consider this diagnosis, especially if there are signs of renal failure or hemolytic anemia.
• Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis can present with chronic diarrhea and abdominal pain. Although less likely given the acute onset, missing these diagnoses could lead to significant morbidity.

Rare Diagnoses

• Yersiniosis: A bacterial infection caused by Yersinia enterocolitica, which can be found in undercooked meat. It's a rare cause of gastroenteritis but should be considered in the appropriate context.
• Parasitic Infections (e.g., Cryptosporidiosis, Cyclosporiasis): These infections are less common but can cause prolonged diarrhea. They might be considered if the patient has a history of travel to endemic areas or exposure to contaminated water.
• Food Allergy or Intolerance: Although less likely to cause acute diarrhea and abdominal cramping without other symptoms, severe food allergies or intolerances (e.g., lactose intolerance) could be considered if other diagnoses are ruled out.