New York — The World Health Organization (WHO) has explained a significant increase in the number of countries moving towards malaria elimination, with prevention efforts saving millions of dollars in healthcare costs over the past 14 years in many African countries.
According to the "World Malaria Report 2015", released on Wednesday, more than half (57) of the 106 countries with malaria in 2000 had achieved reductions in new malaria cases of at least 75% by 2015. In that same time frame, 18 countries reduced their malaria cases by 50-75%.
Across sub-Saharan Africa, the prevention of new cases of malaria has resulted in major cost savings for endemic countries, says the report.
New estimates presented in the WHO report show that reductions in malaria cases attributable to malaria control activities saved an estimated US$ 900 million in case management costs in the region between 2001 and 2014. Insecticide-treated mosquito nets contributed the largest savings, followed by artemisinin-based combination therapies and indoor residual spraying.
"Since the start of this century, investments in malaria prevention and treatment have averted over 6 million deaths. We know what works. The challenge now is to do even more." says Dr Margaret Chan, WHO Director-General, in the report.
For the first time since WHO began keeping score, the European Region is reporting zero indigenous cases of malaria. This achievement was made possible through strong country-level leadership, technical support from WHO and financial assistance from the Global Fund to Fight AIDS, Tuberculosis and Malaria.
Since 2000, the malaria mortality rate has declined by 85% in the South-East Asia Region, by 72% in the Region of the Americas, by 65% in the Western Pacific Region, and by 64% in the Eastern Mediterranean Region. While the African Region continues to carry the highest malaria burden, here too there have been impressive gains: over the last 15 years, malaria mortality rates fell by 66% among all age groups, and by 71% among children under five, a population particularly susceptible to the disease.
Country-level and regional progress in malaria control is reflected in global disease trends. Since 2000, malaria incidence and death rates have fallen by 37% and 60%, respectively, around the world. Among children under five, malaria death rates have declined by 65%. An estimated 6.2 million deaths have been averted since 2000.
According to the report, Target 6C of the Millennium Development Goals--which aimed to halt and reverse the global incidence of malaria between 2000 and 2015--has been achieved. Substantial progress has also been made towards the 2005 World Health Assembly target of a 75% reduction in the global burden of malaria by 2015.
Progress has resulted, in large part, from the massive deployment of effective and low-cost malaria control interventions. Since 2000, nearly 1 billion insecticide-treated mosquito nets have been distributed in sub-Saharan Africa. By 2015, about 55% of the population in this region was sleeping under mosquito nets, up from less than 2% coverage in 2000.
Rapid diagnostic tests have made it easier to swiftly distinguish between malarial and non-malarial fevers, enabling timely and appropriate treatment. A sharp increase in diagnostic testing for malaria has been reported in the WHO African Region: from 36% of suspected malaria cases in 2005 to 65% of cases in 2014. Artemisinin-based combination therapies (ACTs), introduced widely over the past decade, have been highly effective against P. falciparum, the most prevalent and lethal malaria parasite affecting humans.
An estimated 663 million cases of malaria have been averted in sub-Saharan Africa since 2001 as a direct result of the scale-up of three key malaria control interventions: insecticide-treated mosquito nets, indoor residual spraying and artemisinin-based combination therapy. Mosquito nets have had the greatest impact, accounting for about 68% of cases prevented through these interventions.
Despite progress, significant challenges remain. Globally, about 3.2 billion people, nearly half of the world's population--are at risk of malaria. In 2015, there were estimated 214 million new cases of malaria, and approximately 438 000 deaths.
Fifteen countries, mainly in Africa, account for most global malaria cases (80%) and deaths (78%). According to the report, these high burden countries have achieved slower-than-average declines in malaria incidence (32%) compared to other countries globally (53%). In many of these countries, weak health systems continue to impede progress in malaria control.
Millions of people are still not receiving the services they need to prevent and treat malaria. In 2014, approximately one third of people at risk of malaria in sub-Saharan Africa lived in households that lacked protection from mosquito nets or indoor residual spraying.
"As the global burden of malaria declines, new challenges have emerged. In many countries, progress is threatened by the rapid development and spread of mosquito resistance to insecticides. Drug resistance could also jeopardize recent gains in malaria control." Dr Pedro Alonso, Director of the WHO Global Malaria Programme, also says in the report.
Since 2010, 60 of the 78 countries that monitor insecticide resistance have reported mosquito resistance to at least one insecticide used in nets and indoor spraying; of these, 49 reported resistance to two or more insecticide classes. Parasite resistance to artemisinin-- the core compound of the best available antimalarial medicines--has been detected in 5 countries of the Greater Mekong subregion.