A 17-year-old girl presents with complaints of nausea and multiple episodes of vomiting. She also complains of two episodes of non-bloody diarrhea. The detailed history reveals the consumption of rice at a local restaurant a few hours ago. On presentation, she is afebrile, has a pulse rate of 84 bpm, a blood pressure of 110/60 mmHg, and a respiratory rate of 18 breaths/min. The physical examination does not reveal any significant findings. She has a hemoglobin level of 10 g/dl, a white cell count of 9500/mm3, and a platelet count of 345,000/mm3. Supportive management is initiated. The organisms stain purple on a Gram-stain, and further microscopic studies reveal the presence of aerobic bacilli. What is the most likely causative organism in this patient?

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