Email updates

Keep up to date with the latest news and content from Malaria Journal and BioMed Central.

Open Access Highly Accessed Research

Placental infections with histologically confirmed Plasmodium falciparum are associated with adverse birth outcomes in India: a cross-sectional study

Rukhsana Ahmed1, Neeru Singh2, Feiko O ter Kuile1, Praveen K Bharti2, Pushpendra P Singh2, Meghna Desai3, Venkatachalam Udhayakumar3 and Dianne J Terlouw14*

Author Affiliations

1 Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK

2 National Institute of Malaria Research Field Station, Regional Medical Research Centre, Jabalpur, India

3 Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA

4 Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi

For all author emails, please log on.

Malaria Journal 2014, 13:232  doi:10.1186/1475-2875-13-232

Published: 13 June 2014

Abstract

Background

Few studies have assessed placental malaria infections from low transmission areas by histopathology to define their impact and underlying mechanisms.

Methods

Peripheral smears and rapid diagnostic tests (RDTs), placental smears and histological samples, birth weight and gestational age were collected from 2,282 deliveries in three hospitals during a one-year (2006–2007) continuous cross-sectional survey in Madhya Pradesh. Placental histopathology included all 50 cases positive by microscopy or RDT plus 456 randomly selected samples of women negative for malaria by microscopy or RDT. Histological examination included parasites, inflammatory cells, pigment in fibrin, and morphological changes.

Results

There were 52 histology-positive cases; 38 (73.1%) active (acute and chronic) and 14 past infections. Intervillous parasitaemia was low (60% had < 1% parasitaemia) and monocytosis mostly mild (63%). Compared with uninfected placentas, acute Plasmodium falciparum infections were associated with stillbirth (RR 3.8, 95% CI 1.2-12.1), lower maternal haemoglobin (mean difference: 1.5 g/dL, 95% CI 0.5-2.5), lower birth weight (mean difference 451 g, 95% CI 169–609) and shorter gestation (mean difference 0.8 weeks, 95% CI 0.2-1.4). Chronic or past infections were not associated with these outcomes. Among the 11 peripheral Plasmodium vivax cases, placental parasites were absent, but they were associated with increased placental polymorphonuclear cells.

Conclusions

Malaria associated stillbirth and low birth weight in women with low protective immunity may result, at least in part, from a shortened gestation triggered by acute infection, stressing the importance of early malaria detection.

Keywords:
Malaria; Pregnancy; Placenta; Histopathology; Birth weight; Haemoglobin; Gestational age; India