A mother brings her 3-year-old daughter to the Emergency Department because she is having trouble urinating.The child is not feverish.She has otherwise been healthy except for a bout of diarrhea about 10 days ago.Laboratory test results are as follows:

\begin{array}{|l|l|}\hline\text { TEST } & \text { RESULT } \\\hline \text { RBC } & 4.30 \times 10^{12} / \mathrm{L} \text { (moderate schistocytes }\\&\text { present on peripheral blood smear) }\\\hline \text { WBC } & 5.00 \times 10^{9} / \mathrm{L} \\\hline \text { PLT } & 28 \times 10^{9} / \mathrm{L} \\\hline \text { HGB } & 13.0 \mathrm{~g} / \mathrm{dL} \\\hline \text { HCT } & 39 \% \\\hline \text { MCV } & 89 \mathrm{fl} \\\hline \text { MCH } & 28 \mathrm{pg} \\\hline \text { MCHC } & 33 \% \\\hline \text { BUN } & 85 \mathrm{mg} / \mathrm{dL}(\mathrm{RR}: 8-24 \mathrm{mg} / \mathrm{dL}) \\\hline \text { CREAT } & 3.3 \mathrm{mg} / \mathrm{dL}(\mathrm{RR}: 0.2-1.3 \mathrm{mg} / \mathrm{dL})\\\hline\end{array}

Based on the history and the laboratory results, what is the most likely diagnosis?
A)DIC
B)Bartonella sp.infection
C)HUS
D)Previous Clostridium sp.infection

What Features Are Identified on the Peripheral Blood Smear in TTP

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