A 4-year-old boy presents with fever, vomiting and severe pain in both legs. Over the preceding two hours, dark purple spots have appeared over his buttocks and lower limbs; they do not fade when pressed. He is irritable, has cold hands and a capillary refill time of 4 seconds, but no obvious joint swelling or localised cellulitis. Which one of the following is the most likely causative organism?
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