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A 9-year-old boy with a two-day history of diarrhea presents to the emergency room with blood in his stools and increased stool volume. He has vomited once. The boy went to a cookout 5 days earlier and ate a hamburger that was still pink inside. On examination he is well, apart from some dehydration. Stool samples contain numerous white blood cells (neutrophils) and bacteria cultured from them are motile gram negativ MacConkey agar. e bacilli that produce lactose-positive (pink) colonies on 1. 3pts. Which organism is most likely causing his infection and why? Remember the two types of info you need to provide. 2. 1pt. How did the boy become infected?
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Answer #1
  1. The bacteria that is most positively causing this infection is; Klebsiella pneumoniae as it ferments lactose and produces pink colonies on MAC. It also causes bloody diarrhea.
  2. The boy became infected by eating the hamburger that was still pink inside as the bacteria was not heat killed.
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