Volume 82, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Duffy binding protein (DBP), a leading malaria vaccine candidate, plays a critical role in erythrocyte invasion. Sixty-eight of 366 (18.6%) subjects had IgG anti-DBP antibodies by enzyme-linked immunosorbent assay (ELISA) in a community-based cross-sectional survey in the Brazilian Amazon Basin. Despite continuous exposure to low-level malaria transmission, the overall seroprevalence decreased to 9.0% when the population was reexamined 12 months later. Antibodies from 16 of 50 (36.0%) subjects who were ELISA-positive at the baseline were able to inhibit erythrocyte binding to at least one of two DBP variants tested. Most (13 of 16) of these subjects still had inhibitory antibodies when reevaluated 12 months later. Cumulative exposure to malaria was the strongest predictor of DBP seropositivity identified by multiple logistic regression models in this population. The poor antibody recognition of DBP elicited by natural exposure to in Amazonian populations represents a challenge to be addressed by vaccine development strategies.


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  • Received : 06 Nov 2008
  • Accepted : 15 Sep 2009

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