Clinical Microbiology Reviews, Jan 1995, 1-21, Vol 8, No. 1
SA Larsen, BM Steiner and AH Rudolph
The lack of a method for demonstrating the presence of Treponema pallidum
by growth necessitates the use of alternative methods. Traditionally, these
methods are divided into direct detection methods (animal inoculation,
dark-field microscopy, etc.) and serologic tests for the presence of
patient antibody against T. pallidum. Serologic methods are further divided
into two classes. One class, the nontreponemal tests, detects antibodies to
lipoidal antigens present in either the host or T. pallidum; examples are
the Venereal Disease Research Laboratory and rapid plasma reagin and tests.
Reactivity in these tests generally indicates host tissue damage that may
not be specific for syphilis. Because these tests are easy and inexpensive
to perform, they are commonly used for screening, and with proper clinical
signs they are suggestive of syphilis. The other class of test, the
treponemal tests, uses specific treponemal antigens. Confirmation of
infection requires a reactive treponemal test. Examples of the treponemal
tests are the microhemagglutination assay for antibodies to T. pallidum and
the fluorescent treponemal antibody absorption test. These tests are more
expensive and complicated to perform than the nontreponemal tests. On the
horizon are a number of direct antigen, enzyme-linked immunosorbent assay,
and PCR techniques. Several of these techniques have shown promise in
clinical trials for the diagnosis of congenital syphilis and neurosyphilis
that are presently difficult to diagnose.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Laboratory diagnosis and interpretation of tests for syphilis
Division of Sexually Transmitted Diseases Laboratory Research, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
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