A direct fluorescent antibody test performed on an animal tissue sample is primarily intended to detect:
Correct answer: A. Microbial antigen in the sample
- A. Microbial antigen in the sample
- B. Serum antibody against the microbe
- C. Bacterial toxin in urine
- D. Host complement concentration
Explanation
In a direct fluorescent antibody test, a fluorescently labelled antibody binds directly to microbial antigen in cells or tissue. Detection of host antibody generally requires an indirect antibody test rather than this direct format.
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About Veterinary Microbiology and Immunology
Covers the structure, classification, growth and transmission of bacteria, viruses, fungi and other disease causing microorganisms in animals. It explains innate and acquired immunity, antibodies, antigens, vaccination, hypersensitivity and diagnostic methods, while distinguishing infectious agents from the immune responses they produce.
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