Improved Performance of COBAS AmpliPrep/COBAS TaqMan Version 2.0 Assay Over Amplicor Monitor Version 1.5 in the Quantification of HIV-1 RNA Viral Load in Abuja, Nigeria

Author(s): Ado Abubakar, Nicaise Ndembi, Obinna Ogbanufe, v Inalegwu, Simi Wilson, Irene Ebagua, Sam Peters, Chris Chime, Patrick Dakum, Alash`le G. Abimiku

Journal Name: Current HIV Research

Volume 13 , Issue 4 , 2015

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Graphical Abstract:


Background: Improved viral detections by the real time PCR over the manual assays have been reported by various manufacturers. However, discrepancies and discordance between different platforms targeting the same pathogen have also been observed at different settings.

Methods: We used an analytical study design to compare the performance of the Cobas Taqman /Cobas Ampliprep version 2.0 against the standard Amplicor Monitor 1.5 using 200 routine clinical samples, in Abuja- Nigeria.

Results: Taqman and Amplicor detected 118/200 (59%) and 83/200 (41.5%) samples respectively. Two of 83 samples (2.4%) undetectable by Cobas Taqman, were detectable by Roche Amplicor, while 5 of 37 samples (13.5%) which were undetectable by Amplicor using Taqman. Among the 81 detectable samples by both assays 4 samples (4.9%) had a log10 difference > 0.5 log copies, while 9 samples (11.1%) showed a wider discrepancy of >1 log10. Bland and Altman’s comparison shows no significant difference between the two methods (p=0.2825) and CI-0.06171 to 0.2087.

Conclusion: We observed a remarkable improvement in the performance of COBAS AmpliPrep/COBAS TaqMan version 2.0 Assay over Amplicor Monitor version 1.5 in the quantification of HIV1 RNA viral load. Discrepancies of clinical significance, in the viral load between the two platforms were also recorded. The implications of the inability of the automated Taqman 2.0 to detect 2.4% of samples detectable by the Amplicor need to be considered by programs, clinicians and the manufacturers. Periodic evaluation of platforms to detect new circulating HIV subtypes within each locality is also recommended.

Keywords: Improved performance, HIV-1 RNA, quantification, viral load.

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Article Details

Year: 2015
Published on: 14 June, 2015
Page: [262 - 267]
Pages: 6
DOI: 10.2174/1570162X13666150121112139
Price: $65

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