A 12-month-old girl is brought to the physician by her mother for a 2-week history of increased bowel motions. These began after she got sick with a “stomach bug.” She was started on table foods at age 6 months. Until that time she was exclusively breastfed. Her MCV is 90 fL. Hemoglobin is 14 g/dL. Which of the following is the most likely explanation for these findings?
Bacterial malabsorption
Deficiency of brush border disaccharidase
Flattening of the intestinal villi
Noncaseating granulomatous inflammation
Transient neuropathy of hypogastric nerves
