Page 1400 - Veterinary Immunology, 10th Edition

brightly. This test can identify the presence of small numbers of
VetBooks.ir bacteria in a sample. For example, it can be used to detect

Mycobacterium avium subspecies paratuberculosis in feces, or to detect
bacteria such as Dichelobacter nodosus, Listeria monocytogenes, or

clostridia in diseased tissues (Fig. 42.3). It may also be employed to
detect viruses in tissue culture or in tissues from infected animals.
Examples include the detection of rabies virus in the brains of
infected animals or feline leukemia virus in infected cat leukocytes

(see Fig. 40.3).

FIG. 42.2 The direct fluorescent antibody assay. This technique is
used to detect antigen by means of FITC-labeled antibody.

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