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Africa

New: WHO toolkit for Integrated Vector Management in sub-Saharan Africa

November 11, 2016 - 10:48 -- Bart G.J. Knols

WHO has just published its toolkit for Integrated Vector Management in sub-Saharan Africa. It is attached here for your perusal (and use!).

This toolkit for integrated vector management (IVM) is designed to help national and regional programme managers coordinate across sectors to design and run large IVM programmes. It is an extension of earlier guidance and teaching material provided by WHO: Handbook for integrated vector management , Monitoring and evaluation indicators for integrated vector management , Guidance on policy-making for integrated vector management and Core structure for training curricula on integrated vector management.

Research: Large-scale production of the malaria vector biocontrol agent Romanomermis iyengari (Nematoda: Mermithidae) in Benin, West Africa

January 17, 2015 - 15:13 -- Bart G.J. Knols
Author(s): 
Thiery BC Alavo, Ayaba Z Abagli, Rafael Pérez-Pacheco, Edward G Platzer
Reference: 
MWJ2015, 6, 1

The mermithid nematode Romanomermis iyengari is one of several natural control alternatives to synthetic pesticides for mosquito suppression. The commonly used mass rearing procedure of R. iyengari involves the use of coarse sand as a substrate for nematode maturation and oviposition. The coarse sand technique gives excellent nematode productivity in North America. However, under West African climatic conditions, this technique generates relatively lesser amounts of infectious worms. We evaluated coconut coir fibres as a replacement for coarse sand to improve yields in large-scale production of R. iyengari in Benin, West Africa. Culex quinquefasciatus was the host for the nematodes, and mosquitoes were blood-fed on chickens. Four days after blood feeding, egg rafts were collected and transferred into trays, each containing 2 l of water. The mosquito larvae were fed with fish food. When the mosquito larvae reached the second instar, preparasites (J2) were added (3 J2/larva) to the incubation trays. Eight days after infection, post-parasitic juveniles were separated from the water containing dead mosquito larvae and other debris using sieves and needles; 2 g of them were deposited in containers with coarse sand or coconut coir fibres and water. Three hours later, the water was drained, the jars covered and stored for eight weeks, after which J2 abundance was determined, using a total of 320 containers for each substrate. The abundance of J2 preparasites was also assessed 3-5 months after storage to determine the impact of long-term storage on the J2 yield. Results. After 2 months storage, 2 g of post-parasites (~457 females and 583 males) yielded an average of 559,300±6094 J2 and 155,818±4427 J2 per container for coconut fibres and for coarse sand, respectively. During long-term storage, yields of J2 on coconut fibres substrate slowly decreased from 442,180±9322 J2 (3 months storage) to 163,632±12,416 J2 per container (5 months storage). On coarse sand substrate, the yield was relatively low and decreased from 49,812±1200 J2 at 3 months storage to 3046±229 J2 at 5 months storage. Under West African climatic conditions, coconut coir fibres gave significantly higher preparasitic nematode yields than the coarse sand technique. 

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Mosquito feeding behavior and how it influences residual malaria transmission across Africa

July 29, 2019 - 15:04 -- Open Access
Author(s): 
Ellie Sherrard-Smith, Janetta E. Skarp, Thomas S. Churcher, et al.
Reference: 
PNAS July 23, 2019 116 (30) 15086-15095

The antimalarial efficacy of the most important vector control interventions—long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS)—primarily protect against mosquitoes’ biting people when they are in bed and indoors.

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NOT Open Access | Mutation Profile of pfdhfr and pfdhps in Plasmodium falciparum among Returned Chinese Migrant Workers from Africa

April 30, 2019 - 15:18 -- NOT Open Access
Author(s): 
Chao Xu, Hui Sun, Qingkuan Wei, Jin Li, Ting Xiao, Xiangli Kong, Yongbin Wang, Guihua Zhao, Longjiang Wang, Gongzhen Liu, Ge Yan, Bingcheng Huang and Kun Yin
Reference: 
Antimicrob. Agents Chemother. April 2019 63:e01927-18

We evaluated markers of sulfadoxine-pyrimethamine (SP) resistance in Plasmodium falciparum among 254 returned migrant workers in China from Africa from 2013 to 2016.

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Insecticides, bednets and medicines may slow malaria down, but real progress requires a more holistic approach

April 25, 2019 - 10:06 -- Fredros Okumu
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IN 30 SECONDS: There is no doubt that bed nets, insecticides, medicines and diagnostics will deliver significant successes against malaria in the short-term. But as major international partners continue prioritizing the commodity-based approach, African governments should be building the necessary resilience in affected communities. Countries should ensure safe houses and physical environments so that exposure to mosquito bites is minimized, strengthen health systems to identify and treat new malaria cases, expand access to health education in schools and households, and improve household economies and food security so that competing priorities are addressed. This needs to be a long-term strategy, paid for by domestic funding, subsidies, tax rebates or other innovative financing mechanisms – for example a ten-dollar malaria levy paid by international travelers visiting endemic countries. This way, the affected countries can better avoid malaria deaths and sickness, or rebounds of transmission, which currently place such a strain on national health outcomes and development.

Population pharmacokinetics and pharmacodynamics of the artesunate–mefloquine fixed dose combination for the treatment of uncomplicated falciparum malaria in African children

April 22, 2019 - 12:28 -- Open Access
Author(s): 
Monia Guidi, Thomas Mercier, Manel Aouri, Laurent A. Decosterd, Chantal Csajka, Bernhards Ogutu, Gwénaëlle Carn and Jean-René Kiechel
Reference: 
Malaria Journal 2019 18:139, 18 April 2019

The population pharmacokinetic models developed for both AS/DHA and MQ showed a large variability in drug exposure in the investigated African paediatric population.

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Seasonal malaria chemoprevention combined with community case management of malaria in children under 10 years of age, over 5 months, in south-east Senegal: A cluster-randomised trial

March 28, 2019 - 16:07 -- Open Access
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Author(s): 
Jean Louis A. Ndiaye, Youssoupha Ndiaye, Paul Milligan, et al.
Reference: 
PLoS Med 16(3): e1002762

 

In this study SMC for children under 10 years of age given over 5 months was feasible, well tolerated, and effective in preventing malaria episodes, and reduced the prevalence of parasitaemia and anaemia. SMC with CCM achieved high coverage and ensured children with malaria were promptly treated with artemether-lumefantrine.

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Detection of Plasmodium falciparum infected Anopheles gambiae using near-infrared spectroscopy

March 20, 2019 - 15:47 -- Open Access
Author(s): 
Marta F. Maia, Melissa Kapulu, Michelle Muthui, Martin G. Wagah, Heather M. Ferguson, Floyd E. Dowell, Francesco Baldini and Lisa-Ranford Cartwright
Reference: 
Malaria Journal 2019 18:85, 19 March 2019

Accurate, low-cost, reagent-free screening of mosquito populations enabled by NIRS could revolutionize surveillance and elimination strategies for the most important human malaria parasite in its primary African vector species.

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Antibody responses to merozoite antigens after natural Plasmodium falciparum infection: kinetics and longevity in absence of re-exposure

February 9, 2019 - 18:45 -- Open Access
Author(s): 
Victor Yman, Michael T. White, Muhammad Asghar, Christopher Sundling, Klara Sondén, Simon J. Draper, Faith H. A. Osier and Anna Färnert
Reference: 
BMC Medicine 201917:22

Prospective studies of travellers with different levels of prior exposure, returning to malaria-free countries with Plasmodium infection, offer a unique opportunity to investigate the kinetics and composition of the antibody response after natural infection.

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