The difference between direct and indirect immunofluorescence testing is that
A. Indirect testing determines the identity of an unknown antigen in a patient sample, whereas direct testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera.
B. Direct testing adds antibodies directly to antigens, whereas indirect testing cultures the organisms first and adds fluorescent tags to the patient sample.
C. Direct testing determines the identity of an unknown antibody in a patient sample, whereas indirect testing determines whether the patient is infected with a specific antigen.
D. Direct testing determines the identity of an unknown antigen in a patient sample, whereas indirect testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera.
Answer: D
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