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Journal Article
|Research

In vivo parasitological measures of artemisinin susceptibility

Stepniewska K, Ashley EA, Lee SJ, Anstey NM, Barnes KI, Binh TQ, D'Alessandro U, Day NPJ, de Vries PJ, Dorsey G, Guthmann JP, Mayxay M, Newton PN, Olliaro PL, Osorio L, Price RN, Rowland M, Smithuis FM, Taylor WRJ, Nosten F, White NJ
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In vivo parasitological measures of artemisinin susceptibility | Journal Article / Research | MSF Science Portal
Abstract
Parasite clearance data from 18,699 patients with falciparum malaria treated with an artemisinin derivative in areas of low (n=14,539), moderate (n=2077), and high (n=2083) levels of malaria transmission across the world were analyzed to determine the factors that affect clearance rates and identify a simple in vivo screening measure for artemisinin resistance. The main factor affecting parasite clearance time was parasite density on admission. Clearance rates were faster in high-transmission settings and with more effective partner drugs in artemisinin-based combination treatments (ACTs). The result of the malaria blood smear on day 3 (72 h) was a good predictor of subsequent treatment failure and provides a simple screening measure for artemisinin resistance. Artemisinin resistance is highly unlikely if the proportion of patients with parasite densities of <100,000 parasites/microL given the currently recommended 3-day ACT who have a positive smear result on day 3 is <3%; that is, for n patients the observed number with a positive smear result on day 3 does not exceed (n + 60)/24.

Countries

Thailand

Subject Area

diagnosticsmalaria

Languages

English
DOI
10.1086/650301
Published Date
15 Feb 2010
PubMed ID
20085495
Journal
Journal of Infectious Diseases
Volume | Issue | Pages
Volume 201, Issue 4
Issue Date
2010-02-15
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