27. A 35-year-old woman comes to the physician because of a 2-week history of fatigue. Six months ago, she visited family in Brazil, where she was exposed to domestic and farm animals. Physical examination shows no abnormalities except for pallor. Laboratory studies show a hemoglobin concentration of 7.2 g/dL and a hematocrit of 23%. Which of the following is the most likely causal organism? A) Enterobius vermicularis B) Necator americanus C) Schistosoma mansoni D) Taenia solium E) Trichuris trichiura

27. A 35-year-old woman comes to the physician because of a 2-week history of fatigue. Six months ago, she visited family in Brazil, where she was exposed to domestic and farm animals. Physical examination shows no abnormalities except for pallor. Laboratory studies show a hemoglobin concentration of 7.2 g/dL and a hematocrit of 23%. Which of the following is the most likely causal organism? A) Enterobius vermicularis B) Necator americanus C) Schistosoma mansoni D) Taenia solium E) Trichuris trichiura