Published in:
Open Access
01-12-2011 | Research
Vivax malaria in Mauritania includes infection of a Duffy-negative individual
Authors:
Nathalie Wurtz, Khadijetou Mint Lekweiry, Hervé Bogreau, Bruno Pradines, Christophe Rogier, Ali Ould Mohamed Salem Boukhary, Jamal Eddine Hafid, Mohamed Salem Ould Ahmedou Salem, Jean-François Trape, Leonardo K Basco, Sébastien Briolant
Published in:
Malaria Journal
|
Issue 1/2011
Login to get access
Abstract
Background
Duffy blood group polymorphisms are important in areas where Plasmodium vivax is present because this surface antigen is thought to act as a key receptor for this parasite. In the present study, Duffy blood group genotyping was performed in febrile uninfected and P. vivax-infected patients living in the city of Nouakchott, Mauritania.
Methods
Plasmodium vivax was identified by real-time PCR. The Duffy blood group genotypes were determined by standard PCR followed by sequencing of the promoter region and exon 2 of the Duffy gene in 277 febrile individuals. Fisher's exact test was performed in order to assess the significance of variables.
Results
In the Moorish population, a high frequency of the FYB
ES
/FYB
ES
genotype was observed in uninfected individuals (27.8%), whereas no P. vivax-infected patient had this genotype. This was followed by a high level of FYA/FYB, FYB/FYB, FYB/FYB
ES
and FYA/FYB
ES
genotype frequencies, both in the P. vivax-infected and uninfected patients. In other ethnic groups (Poular, Soninke, Wolof), only the FYB
ES
/FYB
ES
genotype was found in uninfected patients, whereas the FYA/FYB
ES
genotype was observed in two P. vivax-infected patients. In addition, one patient belonging to the Wolof ethnic group presented the FYB
ES
/FYB
ES
genotype and was infected by P. vivax.
Conclusions
This study presents the Duffy blood group polymorphisms in Nouakchott City and demonstrates that in Mauritania, P. vivax is able to infect Duffy-negative patients. Further studies are necessary to identify the process that enables this Duffy-independent P. vivax invasion of human red blood cells.