In an Immunodiffusion Test to Diagnose the Fungal Disease Histoplasmosis

question 9

Multiple Choice

In an immunodiffusion test to diagnose the fungal disease histoplasmosis, a patientʹs serum is placed in a well in an agar plate. In a positive test, a precipitate forms as the serum diffuses from the well and meets material diffusing from a second well. In this test process, what is the most likely identity of the material in the second well?

• A) red blood cells
• B) a purified fungal antigen
• C) a purified protozoan antigen
• D) antibodies
• E) entire fungal cells

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