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Clinical Microbiology Reviews, Apr 1997, 242-256, Vol 10, No. 2
M Ieven and H Goossens
Clinical laboratories are increasingly receiving requests to perform
nucleic acid amplification tests for the detection of a wide variety of
infectious agents. In this paper, the efficiency of nucleic acid
amplification techniques for the diagnosis of respiratory tract infections
is reviewed. In general, these techniques should be applied only for the
detection of microorganisms for which available diagnostic techniques are
markedly insensitive or nonexistent or when turnaround times for existing
tests (e.g., viral culture) are much longer than those expected with
amplification. This is the case for rhinoviruses, coronaviruses, and
hantaviruses causing a pulmonary syndrome, Bordetella pertussis, Chlamydia
pneumoniae, Mycoplasma pneumoniae, and Coxiella burnetii. For Legionella
spp. and fungi, contamination originating from the environment is a
limiting factor in interpretation of results, as is the difficulty in
differentiating colonization and infection. Detection of these agents in
urine or blood by amplification techniques remains to be evaluated. In the
clinical setting, there is no need for molecular diagnostic tests for the
diagnosis of Pneumocystis carinii. At present, amplification methods for
Mycobacterium tuberculosis cannot replace the classical diagnostic
techniques, due to their lack of sensitivity and the absence of specific
internal controls for the detection of inhibitors of the reaction. Also,
the results of interlaboratory comparisons are unsatisfactory. Furthermore,
isolates are needed for susceptibility studies. Additional work remains to
be done on sample preparation methods, comparison between different
amplification methods, and analysis of results. The techniques can be
useful for the rapid identification of M. tuberculosis in particular
circumstances, as well as the rapid detection of most rifampin-resistant
isolates. The introduction of diagnostic amplification techniques into a
clinical laboratory implies a level of proficiency for excluding
false-positive and false-negative results.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Relevance of nucleic acid amplification techniques for diagnosis of respiratory tract infections in the clinical laboratory
Department of Microbiology, University Hospital, Antwerp, Belgium.
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