LAMP Detection of Malaria in PREGnancy (LAMPREG) Trial

Malaria in pregnancy often results in high degree of morbidity and mortality of the pregnant mother and the fetus. Early and accurate diagnosis of subclinical infections will be critical to malaria elimination and specifically the goals of the World Health Organization to reduce the burden of disease by 90% before 2030. This goal can only be achieved using highly sensitive methods such as LAMP that are capable of detecting subclinical infections with very low parasitemia. Currently both Giemsa stained blood film microscopy and RDT are the only laboratory methods that are used to diagnose malaria both in pregnant mothers and the general population. This leaves a big gap in the detection of low-level infections and asymptomatic malaria due to the documented lack of sensitivity of the aforementioned methods. This, in turn, predisposes pregnant mothers to malaria-related complications that endangers the life of the mother and the fetus. In this study, we propose that the use of a highly sensitive LAMP technique will enable us to detect more asymptomatic Plasmodium infections in pregnant women. This consequently results in early treatment of the pregnant mothers and may avert maternal and fetal morbidity and mortality. This study is of particular importance in Ethiopia where IPT is not used for pregnant women and therefore accurate screening is paramount.

OBJECTIVES

General objective To assess the impact of LAMP in the diagnosis of malaria in pregnancy and its potential role in reducing mortality and morbidity attributable to malaria. We hypothesize that the additional sensitivity of LAMP coupled with active case detection in detecting malaria in pregnancy will result in additional cases being identified and treated.

Specific objectives

1. To evaluate the impact of LAMP versus microscopy/RDT for the detection of malaria in pregnant mothers in terms maternal and infant morbidity and mortality.

2. To evaluate the impact of enhanced case detection of malaria in pregnancy by screening asymptomatic mothers at each antenatal visit until delivery.

3. To determine the impact of treating LAMP-positive asymptomatic and symptomatic pregnant women as compared to standard of care. Treatment is per national guidelines.

MATERIALS AND METHODS

Study area The study will be conducted at sites across several sites in Ethiopia to obtain sufficient enrolment and spanning different transmission settings based on epidemiological data provided by the Federal Ministry of Health. The study sites are in the Amhara region (Chisabay Health center, Hamusit health center and Andasa Health center), and in the Jimma area (Bonga (GebreTsadik Shawo) General hospital, Uffa health center and Lare health center). In Ethiopia, malaria is characterized by its seasonality where the peak transmission season is from October to December with a second peak in June. P. falciparum and P. vivax are the predominant species in the area.

Study design and period

The study is a prospective diagnostic study of malaria in pregnant women. The goal is to determine whether: (i) LAMP provides a clinically measurable benefit compared to current first line diagnostic test of Giemsa-stained microscopy and whether (ii) enhanced case detection of asymptomatic mothers with LAMP has added value in terms of outcomes. We hypothesize that addition of LAMP to one arm will be of greater benefit than microscopy alone due to additional LAMP sensitivity. We further hypothesize that enhanced case detection by screening asymptomatic mothers at each antenatal visit will be of additional value in treating malaria. Both symptomatic and asymptomatic first and second trimester mothers will be included in the study and individually randomized to one of two arms: standard of care or enhanced cased detection arms using LAMP for malaria. Mothers will be enrolled during a seven-month period from June 2021 to January 2022 and then followed until 28 days after delivery. Given the rate of pregnant mothers at the locations, we anticipate that the required minimum of 2583 mothers will be enrolled in the study during the study period. In the first standard of care arm, venous blood sample will be collected from each study participant and the presence of Plasmodium infection will be diagnosed by microscopy in symptomatic patients. Pregnant women who test positive for malaria will be referred and treated for malaria with quinine or ACTs as per national guidelines. In the second (test) arm, mothers whether symptomatic or asymptomatic will be tested by a commercially available CE-approved LAMP malaria test (Human Diagnostics LoopAMP (Wiesbaden, Germany)) at each clinic visit in addition to RDT/microscopy. The commercial LAMP tests can distinguish P. falciparum and P. vivax and treatment will be given according to national guidelines. The purpose of doing all tests in the intervention arm is to determine how many additional cases LAMP identified. The primary outcome is the proportion of deliveries with low birth weight, with secondary outcomes of: (i) absolute birth weight; (ii) maternal hemoglobin; (ii) neonatal hemoglobin at birth (Standard Hgb testing from peripheral blood or finger prick); (iv) neonatal mortality; (v) pregnancy loss; and (vi) prematurity in each of the two arms.