A new visually improved and sensitive loop mediated isothermal amplification (LAMP) for diagnosis of symptomatic falciparum malaria.

Authors:
Abu Naser Mohon
Abu Naser Mohon
University of Calgary
Canada
Rubayet Elahi
Rubayet Elahi
Virginia Tech
PhD Student
Blacksburg, VA | United States
Wasif A Khan
Wasif A Khan
International Centre for Diarrhoeal Disease Research
Rashidul Haque
Rashidul Haque
University of Virginia
United States
David J Sullivan
David J Sullivan
Bloomberg School of Public Health
United States
Mohammad Shafiul Alam
Mohammad Shafiul Alam
Clinical Sciences Division. wakhan@icddrb.org

Acta Trop 2014 Jun 5;134:52-7. Epub 2014 Mar 5.

International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh. Electronic address:

Molecular diagnosis of malaria by nucleotide amplification requires sophisticated and expensive instruments, typically found only in well-established laboratories. Loop-mediated isothermal amplification (LAMP) has provided a new platform for an easily adaptable molecular technique for molecular diagnosis of malaria without the use of expensive instruments. A new primer set has been designed targeting the 18S rRNA gene for the detection of Plasmodium falciparum in whole blood samples. The efficacy of LAMP using the new primer set was assessed in this study in comparison to that of a previously described set of LAMP primers as well as with microscopy and real-time PCR as reference methods for detecting P. falciparum. Pre-addition of hydroxy napthol blue (HNB) in the LAMP reaction caused a distinct color change, thereby improving the visual detection system. The new LAMP assay was found to be 99.1% sensitive compared to microscopy and 98.1% when compared to real-time PCR. Meanwhile, its specificity was 99% and 100% in contrast to microscopy and real-time PCR, respectively. Moreover, the LAMP method was in very good agreement with microscopy and real-time PCR (0.94 and 0.98, respectively). This new LAMP method can detect at least 5parasites/μL of infected blood within 35min, while the other LAMP method tested in this study, could detect a minimum of 100parasites/μL of human blood after 60min of amplification. Thus, the new method is sensitive and specific, can be carried out in a very short time, and can substitute PCR in healthcare clinics and standard laboratories.

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http://dx.doi.org/10.1016/j.actatropica.2014.02.016DOI Listing

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June 2014
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