In an Immunodiffusion Test to Diagnose Histoplasmosis, a Patientʹs Serum

question 8

Multiple Choice

In an immunodiffusion test to diagnose histoplasmosis, a patientʹs serum is placed in a well in an agar plate. In a positive test, a line forms as the serum diffuses from the well and meets material diffusing from a second well. What type of test is this?

• A) a precipitation reaction
• B) a direct ELISA test
• C) a complement-fixation test
• D) an agglutination reaction
• E) an indirect ELISA test

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