Field deployment of loop-mediated isothermal amplification for centralized mass-screening of asymptomatic malaria in Zanzibar: a pre-elimination setting.

Abstract:

BACKGROUND:Molecular tools for detection of low-density asymptomatic Plasmodium infections are needed in malaria elimination efforts. This study reports results from the hitherto largest implementation of loop-mediated isothermal amplification (LAMP) for centralized mass screening of asymptomatic malaria in Zanzibar. METHODS:Healthy individuals present and willing to participate in randomly selected households in 60 villages throughout Zanzibar were screened for malaria by rapid diagnostic tests (RDT). In 50% of the study households, participants were asked to provide 60 μL of finger-prick blood for additional LAMP screening. LAMP was conducted in two centralized laboratories in Zanzibar, by trained technicians with limited or no previous experience of molecular methods. The LAMP assay was performed with Loopamp(TM) MALARIA Pan/Pf Detection Kit (Eiken Chemical Company, Japan). Samples positive for Plasmodium genus (Pan)-LAMP were re-tested using Plasmodium falciparum-specific LAMP kits. RESULTS:Paired RDT and LAMP samples were available from 3983 individuals. The prevalence of asymptomatic malaria was 0.5% (CI 95% 0.1-0.8) and 1.6% (CI 95% 1.1-2.2) by RDT and Pan-LAMP, respectively. LAMP detected 3.4 (CI 95% 2.2-5.2) times more Plasmodium positive samples than RDT. DNA contamination was experienced, but solved by repetitive decontamination of all equipment and reagents. CONCLUSIONS:LAMP is a simple and sensitive molecular tool, and has potential in active surveillance and mass-screening programmes for detection of low-density asymptomatic malaria in pre-elimination settings. However, in order to deploy LAMP more effectively in field settings, protocols may need to be adapted for processing larger numbers of samples. A higher throughput, affordable closed system would be ideal to avoid contamination.

journal_name

Malar J

journal_title

Malaria journal

authors

Morris U,Khamis M,Aydin-Schmidt B,Abass AK,Msellem MI,Nassor MH,González IJ,Mårtensson A,Ali AS,Björkman A,Cook J

doi

10.1186/s12936-015-0731-2

subject

Has Abstract

pub_date

2015-05-17 00:00:00

pages

205

issn

1475-2875

pii

10.1186/s12936-015-0731-2

journal_volume

14

pub_type

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