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A first year medical student fails to use proper disinfection techniques in carrying out his microbiology experiment. Two weeks later, he has spiking fevers and cramping abdominal pain with diarrhea. On physical examination his temperature is 38.3 C, pulse 100/minute, respiratory rate 19/minute, and blood pressure 100/60 mm Hg. He has a palpable spleen tip and diffuse abdominal pain without masses. Laboratory studies show a WBC count of 2330/microliter, Hgb 13.8 g/dL, and platelet count 282,000/microliter. Which of the following organisms was he most likely using in his experiment?

A Aspergillus niger
B Entameba histolytica
C Shigella flexneri
D Clostridium difficile
E Yersinia enterocolitica
F Staphylococcus aureus
G Rotavirus
H Salmonella typhi
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