A 4-year-old boy was admitted to the hospital last night with the complaint of “difficulty breathing.” He has no past history of lung infection, no recent travel, and no day-care exposure; he does, however, have an annoying tendency to eat dirt. In the emergency center he was noted to be wheezing and to have hepatomegaly. He is able to talk, relaying his concern about his 6-week-old Chihuahua being left alone at home. Laboratory studies revealed marked eosinophilia (60% eosinophils). Which of the following tests is most likely to produce a specific diagnosis?

a. Tuberculin skin test

b. Histoplasmin test

c. ELISA for Toxocara

d. Silver stain of gastric aspirate

e. Stool examination for ova and parasites

the answer is below…
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