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Review Articles |
From the Clinical Virology Research Unit,
*
Sir Albert Sakzewski Virus Research Centre, Royal Children’s Hospital and Health Service District, Queensland; the Clinical Medical Virology Centre,
University of Queensland, Queensland; the Microbiology Department,
South Eastern Area Laboratory Services, Sydney, New South Wales; and the Microbiology Division,
Queensland Health Pathology Service, Royal Brisbane and Women’s Hospital Campus, Brisbane, Queensland, Australia
Abstract
Nucleic acid amplification tests (NAATs) for the detection of Neisseria gonorrhoeae became available in the early 1990s. Although offering several advantages over traditional detection methods, N. gonorrhoeae NAATs do have some limitations. These include cost, risk of carryover contamination, inhibition, and inability to provide antibiotic resistance data. In addition, there are sequence-related limitations that are unique to N. gonorrhoeae NAATs. In particular, false-positive results are a major consideration. These primarily stem from the frequent horizontal genetic exchange occurring within the Neisseria genus, leading to commensal Neisseria species acquiring N. gonorrhoeae genes. Furthermore, some N. gonorrhoeae subtypes may lack specific sequences targeted by a particular NAAT. Therefore, NAAT false-negative results because of sequence variation may occur in some gonococcal populations. Overall, the N. gonorrhoeae species continues to present a considerable challenge for molecular diagnostics. The need to evaluate N. gonorrhoeae NAATs before their use in any new patient population and to educate physicians on the limitations of these tests is emphasized in this review.
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