Abstract |
Reports from several sites in South America suggest the presence of isolated cases of chloroquine-resistant Plasmodium vivax malaria. To investigate the possibility of chloroquine-resistant P. vivax in Peru, we conducted 28-day in vivo drug efficacy trials at three sites in the Amazon region and one site on the northern Pacific Coast between 1998 and 2001. A total of 242 patients between the ages of 2 and 60 years were enrolled (177 from the Amazon region and 65 from the northern coast). All subjects received directly observed therapy with chloroquine, 25 mg/kg, over a three-day period. On enrollment, 49% had a documented fever and 96% had a history of fever; their geometric mean parasite density was 5,129 parasites/microL. A total of 212 (88%) of the 242 subjects completed their 28-day follow-up. Four of the 177 patients from the Amazon region had a recurrence of P. vivax parasitemia on days 21 and 28 after treatment was initiated. Two of these patients had chloroquine-resistant infections, based on polymerase chain reaction-single-stranded conformational polymorphism genotyping and chloroquine- desethylchloroquine blood levels, which were > or = 97 ng/mL at the time of the reappearance of parasitemia. None of the subjects studied on the northern Pacific Coast had recurrent parasitemia.
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Authors | Trenton K Ruebush 2nd, Jorge Zegarra, Javier Cairo, Ellen M Andersen, Michael Green, Dylan R Pillai, Wilmer Marquiño, María Huilca, Ernesto Arévalo, Coralith Garcia, Lely Solary, Kevin C Kain |
Journal | The American journal of tropical medicine and hygiene
(Am J Trop Med Hyg)
Vol. 69
Issue 5
Pg. 548-52
(Nov 2003)
ISSN: 0002-9637 [Print] United States |
PMID | 14695094
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
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Chemical References |
- Antimalarials
- DNA, Protozoan
- Chloroquine
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Topics |
- Adolescent
- Adult
- Animals
- Antimalarials
(pharmacology)
- Child
- Child, Preschool
- Chloroquine
(pharmacology)
- DNA, Protozoan
(analysis)
- Drug Resistance
- Female
- Humans
- Malaria, Vivax
(epidemiology, parasitology, pathology)
- Male
- Middle Aged
- Peru
(epidemiology)
- Plasmodium vivax
(drug effects, genetics)
- Polymerase Chain Reaction
- Recurrence
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