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artemisinin resistance

Open Access | Standardizing the measurement of parasite clearance in falciparum malaria: the parasite clearance estimator

Author(s): 
Flegg JA, Guerin PJ, White NJ, Stepniewska K
Reference: 
Malaria Journal 2011, 10:339 (10 November 2011)
Contact email: 
jennifer.flegg@wwarn.org

MalariaWorldThe parasite clearance estimator provides a consistent, reliable and accurate method to estimate the lag phase and malaria parasite clearance rate.

Recent clinical and molecular insights into emerging artemisinin resistance in Plasmodium falciparum

Author(s): 
O’Brien, Connor; Henrich, Philipp P.; Passi, Neha; Fidock, David A.
Reference: 
Current Opinion in Infectious Diseases, December 2011 - Volume 24 - Issue 6 - p 570–577
Contact email: 
df2260@columbia.edu

MalariaWorldShould ACTs fail, no suitable alternatives exist as first-line treatments of P. falciparum malaria.

Open Access | Methodology: The parasite clearance curve

Author(s): 
N J White
Reference: 
Malaria Journal 2011, 10:278 (22 September 2011)
Contact email: 
nickw@tropmedres.ac

MalariaWorldParasite clearance rates are important measures of anti-malarial drug efficacy. They are particularly important in the assessment of artemisinin resistance.

Open Access | Artesunate Dose Escalation for the Treatment of Uncomplicated Malaria in a Region of Reported Artemisinin Resistance: A Randomized Clinical Trial

Author(s): 
Delia Bethell, Youry Se, Mark M. Fukuda, et al.
Reference: 
PLoS ONE 6(5): e19283
Contact email: 
delia.bethell@afrims.org

There is no pharmacodynamic benefit of increasing the daily dose of AS (4mg/kg) currently recommended for short-course combination treatment of uncomplicated malaria, even in regions with emerging artemisinin resistance, as long as the partner drug retains high efficacy.

Spontaneous Mutations in the Plasmodium falciparum Sarcoplasmic/ Endoplasmic Reticulum Ca2+-ATPase (PfATP6) Gene among Geographically Widespread Parasite Populations Unexposed to Artemisinin-Based Combination Therapies

Author(s): 
Kazuyuki Tanabe, Sedigheh Zakeri, Nirianne Marie Q. Palacpac, Manada Afsharpad, Milijaona Randrianarivelojosia, Akira Kaneko, Aung Swi Prue Marma, Toshihiro Horii, and Toshihiro Mita
Reference: 
Antimicrobial Agents and Chemotherapy, January 2011, p. 94-100, Vol. 55, No. 1
Contact email: 
kztanabe@biken.osaka-u.ac.jp

Recent reports on the decline of the efficacy of artemisinin-based combination therapies (ACTs) indicate a serious threat to malaria control.

Genetic Predisposition Favors the Acquisition of Stable Artemisinin Resistance in Malaria Parasites

Author(s): 
Dorothee Beez, Cecilia P. Sanchez, Wilfred D. Stein, and Michael Lanzer
Reference: 
Antimicrobial Agents and Chemotherapy, January 2011, p. 50-55, Vol. 55, No. 1

The emergence of artemisinin-resistant Plasmodium falciparum malaria jeopardizes efforts to control this infectious disease.

Open Access | Brazilian Plasmodium falciparum isolates: investigation of candidate polymorphisms for artemisinin resistance before introduction of artemisinin-based combination therapy

Author(s): 
Gama BE, Almeida-de-Oliveira NK, de Souza JM, Santos F, de Carvalho LJ, Melo YF, Rosenthal PJ, Daniel-Ribeiro CT, Ferreira-da-Cruz M
Reference: 
Malaria Journal 2010, 9:355 (8 December 2010)
Contact email: 
bgama@ioc.fiocruz.br

Although some polymorphism in pfmdr1 and pfatpase6 were verified, no reported haplotypes in both genes that may mediate altered response to ACT was detected before the introduction of this therapy in Brazil.

Open Access | Dose‐Dependent Risk of Neutropenia after 7‐Day Courses of Artesunate Monotherapy in Cambodian Patients with Acute Plasmodium falciparum Malaria

Author(s): 
Delia Bethell, Youry Se, Mark M. Fukuda, et al.
Reference: 
Clinical Infectious Diseases 15 December 2010, Vol. 51, No. 12:
Contact email: 
delia.bethell@afrims.org

Artesunate remains a crucial drug for the treatment of malaria, and determining optimal dosing regimens is vital to overcome emerging resistant parasite strains along the Thai‐Cambodian border.

Investigations into the Role of the Plasmodium falciparum SERCA (PfATP6) L263E Mutation in Artemisinin Action and Resistance

Author(s): 
Stephanie Gaw Valderramos, Daniel Scanfeld, Anne-Catrin Uhlemann, David A. Fidock, and Sanjeev Krishna
Reference: 
Antimicrobial Agents and Chemotherapy, September 2010, p. 3842-3852, Vol. 54, No. 9
Contact email: 
s.krishna@sgul.ac.uk

Artemisinin-based combination therapies (ACTs) are highly effective for the treatment of Plasmodium falciparum malaria, yet their sustained efficacy is threatened by the potential spread of parasite resistance.

Brief Report: High Heritability of Malaria Parasite Clearance Rate Indicates a Genetic Basis for Artemisinin Resistance in Western Cambodia

Author(s): 
Tim J. C. Anderson, Shalini Nair, Standwell Nkhoma, Jeff T. Williams, Mallika Imwong, Poravuth Yi, Duong Socheat, Debashish Das, Kesinee Chotivanich, Nicholas P. J. Day, Nicholas J. White, and Arjen M. Dondorp
Reference: 
The Journal of Infectious Diseases 2010;201:1326–1330
Contact email: 
tanderso@sfbrgenetics.org

In western Cambodia, malaria parasites clear slowly from the blood after treatment with artemisinin derivatives, but it is unclear whether this results from parasite, host, or other factors specific to this population.

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