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Gambia

Reactive, self-administered malaria treatment against asymptomatic malaria infection: results of a cluster randomized controlled trial in The Gambia

June 9, 2021 - 07:47 -- Open Access
Author(s): 
Joseph Okebe, Edgard Dabira, Umberto D’Alessandro, et al.
Reference: 
Malaria Journal 2021 20:253, 7 June 2021

Selectively targeting and treating malaria-infected individuals may further decrease parasite carriage in low-burden settings. Using a trans-disciplinary approach, a reactive treatment strategy to reduce Plasmodium falciparum prevalence in participating communities was co-developed and tested.

From informed consent to adherence: factors influencing involvement in mass drug administration with ivermectin for malaria elimination in The Gambia

April 28, 2021 - 15:47 -- Open Access
Author(s): 
Alexandra Fehr, Claudia Nieto-Sanchez, Koen Peeters Grietens, et al.
Reference: 
Malaria Journal 2021 20:198, 26 April 2021

The World Health Organization (WHO) recommends consideration of mass drug administration (MDA) for malaria control in low-endemic settings approaching elimination. However, MDA remains a controversial strategy, as multiple individual, social, and operational factors have shown to affect its acceptability at local levels. This is further complicated by inconsistent definitions of key indicators derived from individual and community involvement—coverage, adherence, and compliance—that cast doubts about the actual and potential epidemiological impact of MDA on disease control and elimination. This study aimed to identify limitations and enabling factors impacting involvement at different stages of a large cluster-randomized trial assessing the effect of combining dihydroartemisinin-piperaquine (DP) and ivermectin (IVM) in malaria transmission in The Gambia.

Understanding adherence to reactive treatment of asymptomatic malaria infections in The Gambia

January 20, 2021 - 07:08 -- Open Access
Author(s): 
Jaiteh F, Okebe J, Masunaga Y, D'Alessandro U, Achan J, Gryseels C, de Vries D, Ribera JM, Grietens KP
Reference: 
Sci Rep. 2021 Jan 18;11(1):1746

The impact of different types of reactive case detection and/or treatment strategies for malaria elimination depends on high coverage and participants' adherence. However, strategies to optimise adherence are limited, particularly for people with asymptomatic or no infections. As part of a cluster-randomized trial to evaluate the effect of reactive treatment in The Gambia, all residents in the compound of a diagnosed clinical malaria patient received dihydro-artemisinin-piperaquine (DP). Using a mixed method approach, we assessed which factors contribute to adherence among the contacts of malaria cases that showed no symptoms.

Adoption of evidence-based global policies at the national level: intermittent preventive treatment for malaria in pregnancy and first trimester treatment in Kenya, Malawi, Mali and The Gambia

November 14, 2020 - 16:19 -- Open Access
Author(s): 
Webster J, Hoyt J, Hill J, et al.
Reference: 
Health Policy Plan. 2020 Nov 12:czaa132

In 2012, the World Health Organization (WHO) updated its policy on intermittent preventive treatment in pregnancy with sulphadoxine-pyrimethamine (IPTp-SP). A global recommendation to revise the WHO policy on the treatment of malaria in the first trimester is under review. We conducted a retrospective study of the national policy adoption process for revised IPTp-SP dosing in four sub-Saharan African countries.

NOT Open Access | Artemisinin Activity in Red Blood Cells from Anemic Children

November 11, 2020 - 14:03 -- NOT Open Access
Author(s): 
Joof F, Goheen MM, Cerami C
Reference: 
Am J Trop Med Hyg. 2020 Nov 9

Artemisinin combination therapies are the current frontline therapy for falciparum malaria. Artemisinin is activated by heme iron, and the consequent production of reactive oxygen species and carbon-centered radicals results in rapid parasite clearance. Red blood cells (RBCs) from anemic iron-deficient individuals have decreased levels of heme, and such deficiencies are highly prevalent among children and pregnant women in malaria-endemic countries.

Tolerance of Gambian Plasmodium falciparum to Dihydroartemisinin and Lumefantrine detected by Ex vivo Parasite Survival Rate Assay (PSRA)

October 7, 2020 - 15:39 -- Open Access
Author(s): 
Mbye H, Bojang F, Jawara AS, Njie B, Mohammed NI, Okebe J, D'Alessandro U, Amambua-Ngwa A
Reference: 
Antimicrob Agents Chemother. 2020 Oct 5:AAC.00720-20

Monitoring of Plasmodium falciparum sensitivity to antimalarial drugs in Africa is vital for malaria elimination. However, the commonly used ex-vivo/in-vitro IC50 test is inconsistent for several antimalarials, while the alternative ring-stage survival assay (RSA) for artemisinin derivatives has not been widely adopted. Here we applied an alternative two-colour flow-cytometry based parasite survival rate assay (PSRA) to detect ex-vivo antimalarial tolerance in P. falciparum isolates from The Gambia.

Antibody responses to a suite of novel serological markers for malaria surveillance demonstrate strong correlation with clinical and parasitological infection across seasons and transmission settings in The Gambia

September 29, 2020 - 12:57 -- Open Access
Author(s): 
Wu L, Mwesigwa J, Affara M, Bah M, Correa S, Hall T, Singh SK, Beeson JG, Tetteh KKA, Kleinschmidt I, D'Alessandro U, Drakeley C
Reference: 
BMC Med. 2020 Sep 25;18(1):304

As malaria transmission declines, sensitive diagnostics are needed to evaluate interventions and monitor transmission. Serological assays measuring malaria antibody responses offer a cost-effective detection method to supplement existing surveillance tools.

Measuring ventilation in different typologies of rural Gambian houses: a pilot experimental study

August 4, 2020 - 15:48 -- Open Access
Author(s): 
Jakob B. Knudsen, Margaret Pinder, Ebrima Jatta, Musa Jawara, Mahamed A. Yousuf, Amalie T. Søndergaard and Steve W. Lindsay
Reference: 
Malaria Journal 2020 19:273, 31 July 2020

African houses are frequently too hot and uncomfortable to use a bed net at night. Indoor thermal comfort is often evaluated by measuring temperature and humidity, ignoring ventilation. This study explored ways to measure ventilation in single-roomed rural Gambian houses during the malaria transmission season and evaluated building designs that could increase airflow at night and help keep the occupants comfortable.

Interferon-gamma polymorphisms and risk of iron deficiency and anaemia in Gambian children

June 12, 2020 - 13:58 -- Open Access
Author(s): 
Abuga KM, Rockett KA, Muriuki JM, Koch O, Nairz M, Sirugo G, Bejon P, Kwiatkowski DP, Prentice AM, Atkinson SH
Reference: 
Wellcome Open Res. 2020 Jun 2; 5:40

Anaemia is a major public health concern especially in African children living in malaria-endemic regions. Interferon-gamma (IFN-γ) is elevated during malaria infection and is thought to influence erythropoiesis and iron status. Genetic variants in the IFN-γ gene (IFNG) are associated with increased IFN-γ production. We investigated putative functional single nucleotide polymorphisms (SNPs) and haplotypes of IFNG in relation to nutritional iron status and anaemia in Gambian children over a malaria season.

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