A young man returned from a backpacking trip in Mexico suffering from a high fever, pain in the abdomen, and watery diarrhea. The emergency room doctor noted a faint rash on the patient's abdomen and chest. A blood specimen was collected and plated on MacConkey agar, incubated at 37°C in ambient air. Lactose-negative colonies grew on the plates. The cultured organism was a Gram-negative rod that did not produce Shiga or Shiga-like toxins. The most likely etiological agent for this man's disease is:

A young man returned from a backpacking trip in Mexico suffering from a high fever, pain in the abdomen, and watery diarrhea. The emergency room doctor noted a faint rash on the patient's abdomen and chest. A blood specimen was collected and plated on MacConkey agar, incubated at 37°C in ambient air. Lactose-negative colonies grew on the plates. The cultured organism was a Gram-negative rod that did not produce Shiga or Shiga-like toxins. The most likely etiological agent for this man's disease is:

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A young man returned from a backpacking trip in Mexico suffering from a high fever, pain in the abdomen, and watery diarrhea. The emergency room doctor noted a faint rash on the patient's abdomen and chest. A blood specimen was collected and plated on MacConkey agar, incubated at 37°C in ambient air. Lactose-negative colonies grew on the plates. The cultured organism was a Gram-negative rod that did not produce Shiga or Shiga-like toxins. The most likely etiological agent for this man's disease is:



A. Vibrio parahaemolyticus
B. Salmonella typhi
C. Shigella dysenteriae
D. Enterohemorrhagic Escherichia coli


Answer: B. Salmonella typhi


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