Performance of a Highly Sensitive Rapid Diagnostic Test (HS-RDT) for Detecting Malaria in Peripheral and Placental Blood Samples from Pregnant Women in Colombia

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2018 Aug 3

PMID 30071004

Citations 32

Authors

Ana Maria Vasquez

Ana Catalina Medina

Alberto Tobon-Castano

Maritza Posada

Gabriel Jaime Velez

Ana Campillo

Iveth J Gonzalez

Xavier Ding

Affiliations

Soon will be listed here.

Abstract

Background: Pregnancy poses specific challenges for the diagnosis of Plasmodium falciparum infection due to parasite sequestration in the placenta, which translates in low circulation levels in peripheral blood. The aim of this study is to assess the performance of a new highly sensitive rapid diagnostic test (HS-RDT) for the detection of malaria in peripheral and placental blood samples from pregnant women in Colombia.

Methods: This is a retrospective study using 737 peripheral and placental specimens collected from pregnant women in Colombian malaria-endemic regions. Light microscopy (LM), conventional rapid diagnostic tests (Pf/Pv RDT and Pf RDT), and HS-RDT testing were performed. Diagnostic accuracy endpoints of LM, HS-RDT and RDTs were compared with nested polymerase chain reaction (nPCR) as the reference test.

Results: In comparison with nPCR, the sensitivity of HS-RDT, Pf RDT, Pf/Pv RDT and LM to detect infection in peripheral samples was 85.7% (95% CI = 70.6-93.7), 82.8% (95% CI = 67.3-91.9), 77.1% (95% CI = 61.0-87.9) and 77.1% (95% CI = 61.0-87.9) respectively. The sensitivity to detect malaria in asymptomatic women, was higher with HS-RDT, where LM and Pf/Pv RDT missed half of infections detected by nPCR, but differences were not significant. Overall, specificity was similar for all tests (>99.0%). In placental blood, the prevalence of infection by P. falciparum by nPCR was 2.8% (8/286), by HS-RDT was 1% and by conventional RDTs (Pf RDT and Pf/Pv RDT) and LM was 0.7%. The HS-RDT detected placental infections in peripheral blood that were negative by LM and Pf/Pv RDT, however the number of positive placentas was low.

Conclusions: The sensitivity of HS-RDT to detect P. falciparum infections in peripheral and placental samples from pregnant women was slightly better compared to routinely used tests during ANC visits and at delivery. Although further studies are needed to guide recommendations on the use of the HS-RDT for malaria case management in pregnancy, this study shows the potential value of this test to diagnose malaria in pregnancy in low-transmission settings.

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