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Fourteen published and three newly identified polymorphic microsatellites were used to genotype 69 Plasmodium vivax samples obtained from 39 patients detected over a period of two years who lived in a rural community of central Vietnam. All samples were polyclonal with an average expected heterozygosity of 0.86. Among the 39 patients, 16 experienced 1–5 recurrent episodes of P. vivax malaria, most of them (83%) with a different genotype profile compared with previous infections. The minimal set of microsatellites required for differentiating the genotype profiles of the recurrent infections compared with the full set of 17 microsatellites was explored. A combination of five markers was sufficient to identify all recurrent infections with an unrelated or different genotype profile compared with all previous episodes.
Financial support: This study was supported by the Flemish government funds (Fonds voor Wetenschappelijk Onderzoek) and the Institute for the Promotion of Innovation by Science, and Technology in Flanders (PhD grant). The field study in Vietnam was supported by the Framework Agreement 2 between the Institute of Tropical Medicine Antwerp, and the Belgian Technical Cooperation.
Authors' addresses: Peter Van den Eede, Annette Erhart, Gert Van der Auwera, Chantal Van Overmeir, and Umberto D'Alessandro, Department of Parasitology, Institute of Tropical Medicine, Antwerp, Belgium, E-mails: pvandeneede@itg.be, aerhart@itg.be, gvdauwera@itg.be, cvovermeir@itg.be, and udalessandro@itg.be. Ngo Duc Thang and Le Xuan Hung, National Institute of Malariology, Parasitology and Entomology, BC 10200 Tu Liem District, Hanoi, Vietnam, E-mails: thangnimpevn@yahoo.com and lxhung1952@yahoo.com. Jozef Anné, Laboratory of Bacteriology, Katholieke Universiteit Leuven, 3000 Leuven, Belgium, E-mail: jozef.anne@rega.kuleuven.be.
Reprint requests: Peter Van den Eede, Department of Parasitology, Institute of Tropical Medicine Antwerp, Nationalestraat 155 Antwerp, Belgium, E-mail: pvandeneede@itg.be.