In an analysis of 25 years' worth of data from 50,981 women at antenatal clinics at the Shoklo Malaria Research Unit, researchers found that the number of deaths from Plasmodium falciparum malaria fell from an estimated 1000 deaths per 100,000 pregnant women before the introduction of screening to zero in 2005.
The Shoklo Malaria Research Unit is part of the Wellcome Trust-Mahidol University-Oxford Tropical Medicine Research Programme, based in the refugee camps on the border of Thailand and Myanmar. It is situated in a region where malaria is endemic.
Researchers at the Unit studied all medical records from women attending its antenatal clinics from May 1986 to the end of 2010 to assess levels of maternal mortality. A significant disparity exists in maternal mortality between women living in low-income countries and those living in high-income countries: a study in 2005 estimated that the average lifetime risk of dying from complications related to pregnancy or childbirth was 300 times higher in the lowest-income countries. Even less well documented is maternal death in high-risk groups such as migrants and refugees.
In findings published today in the journal 'PLoS ONE', researchers at Shoklo found a six-fold decline in maternal mortality - from 499 in the period 1986-1990 to 79 in the period 2006-2010 - among refugees. A substantial proportion of this reduction in deaths was due to the early detection and treatment of malaria.
Dr Rose McGready from the Shoklo Malaria Research Unit says: "We have seen a massive reduction in malaria-related maternal mortality. This gives us hope and shows that deaths from malaria are preventable.
"Even though treatment options for pregnant women infected with malaria are limited, frequent antenatal screening clearly works and, as such, we believe it should play a larger part in tackling the disease. However, there are still significant rates of maternal death in the more mobile migrant populations, and this is something that needs to be addressed."
Alongside malaria-related deaths, the most common causes of death among pregnant women were haemorrhage and sepsis (infection of the blood).
"Clearly haemorrhage and sepsis need to be tackled as overall mortality remains high, despite advances against malaria," adds Dr McGready. "Delivery with trained midwives rather than at home is likely to have a significant impact, but access remains a problem for migrant women. More outreach to these women during or before their pregnancy will be needed."