In vivo chloroquine resistance and prevalence of the pfcrt codon 76 mutation in Plasmodium falciparum isolates from the Republic of Congo.
Chloroquine (CQ) resistance in Plasmodium falciparum has been particularly associated with mutations in the pfcrt gene. The present study was carried out in the malaria hyperendemic town of Brazzaville (Republic of Congo, Central Africa) where CQ is still recommended and used as a first-line drug for P. falciparum malaria. We assessed the efficacy of CQ in vivo, and the association between pfcrt mutation at codon 76 and treatment outcome in 50 children with uncomplicated malaria. The failure rate on day 28 was 95.7% and the pfcrt K76T mutation was present in 100% of isolates. No variation in the multiplicity of infection was observed in pre- and post-treatment isolates. In further 87 isolates from uncomplicated patients not treated with CQ, the mutation was detected in 98.5% of isolates. This study confirms the high level of in vivo resistance to CQ and shows the high prevalence of pfcrt K76T mutation in the Republic of Congo.
Albert Schweitzer Hospital, BP 118, Lambaréné, Gabon.
Pembe Issamou
PI
Mayengue
Mathieu
M
Ndounga
Matondo Maya
MM
Davy
Ntsonde
N
Tandou
Francine
F
Ntoumi
D000818:Animals; D000962:Antimalarials / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D002738:Chloroquine / Q000494:pharmacology / Q000627:therapeutic use*; D003223:Congo; D016054:DNA, Protozoan / Q000235:genetics* / Q000302:isolation & purification; D005838:Genotype; D006801:Humans; D007223:Infant; D016778:Malaria, Falciparum / Q000188:drug therapy* / Q000469:parasitology / Q000503:physiopathology; D008565:Membrane Proteins / Q000235:genetics*; D026901:Membrane Transport Proteins; D010963:Plasmodium falciparum / Q000187:drug effects / Q000235:genetics* / Q000302:isolation & purification; D015995:Prevalence; D015800:Protozoan Proteins
D000962:Antimalarials; D016054:DNA, Protozoan; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; C416369:PfCRT protein, Plasmodium falciparum; D015800:Protozoan Proteins; D002738:Chloroquine