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Dynamic change of FC level in response to minor systemic/gastrointestinal infection or stress and treatment (FC < 350 μg/g stool) in specific infants. The spots pointed by arrows are when the infants developed clinical symptoms stated in corresponding boxes and treatments started. KUB = Kidney ureter bladder; PDA = patent ductus arteriosus; UTI = urinary tract infection; WBC = white blood cells.
