Evaluating the efficacy of chloroquine for treatment of Plasmodium vivax infection in Binh Phuoc province, Viet Nam

Understanding the extent and regional distribution of CQR vivax malaria and detecting early signs of resistance is critical to prevent the spread of resistant strains, optimize treatment guidelines, and reduce the risk of recurrent and severe malaria. In Vietnam, CQR in P.vivax has been reported sporadically. One study carried out in Binh Thuan province (central-south Vietnam) at the end of the 1990s demonstrated early P.vivax recurrences (7%) by Day 16 after a 3-day CQ treatment. However, in a summary report to World Health Organization (WHO) including data from 11 sentinel sites, from studies conducted between 2006 and 2011 in central and southern Vietnam (total 350 patients), P.vivax is still considered sensitive to CQ. More recently in a cohort study conducted in Quang Nam province (Central Vietnam) in which P.vivax patients were treated radically with CQ and primaquine (10-day at 0.5mg/kg/day) following national guidelines, the 28-day failure rate was measured at 3.45% and CQ blood concentrations measured at day of recurrence (>100ng/ml) confirmed resistance in three patients. The current national guidelines for the radical cure regimen of P.vivax infections recommends 3 days of CQ (total 25 mg/kg body weight (bw)) together with 14 days of primaquine at 0.25 mg/kg bw/ day.

ClinicalTrials.gov ID: NCT02610686

Project information Clinical Trials - Project details

Drug-based Strategies
P. vivax

Feb 2020

Vietnam