6. A 4-year-old girl from a rural community in the southern USA is evaluated for anemia. She has not traveled outside the USA. Her hematocrit is 28%, leukocyte count is 8100/mm³ with 15% eosinophils, and mean corpuscular volume is 65 µm³. Which of the following tests is most likely to yield the correct microbiological diagnosis? A) Blood smear B) Bone marrow biopsy C) Microscopic examination of stool D) Polymerase chain reaction E) Serology

6. A 4-year-old girl from a rural community in the southern USA is evaluated for anemia. She has not traveled outside the USA. Her hematocrit is 28%, leukocyte count is 8100/mm³ with 15% eosinophils, and mean corpuscular volume is 65 µm³. Which of the following tests is most likely to yield the correct microbiological diagnosis? A) Blood smear B) Bone marrow biopsy C) Microscopic examination of stool D) Polymerase chain reaction E) Serology