Effect of Liver and Blood-stage Treatment on Subsequent Plasmodium Reinfection and Morbidity
Host and Parasites Factors Contributing to Risk of Plasmodium Re-infection and Morbidity in Elementary School Children in Maprik, East Sepik Province
  • Phase

    Phase 4
  • Study Type

  • Status

    Completed No Results Posted
  • Study Participants

This study specifically seeks to quantify the contribution of relapes to the burden of P. vivax infections and disease by determining on the effect of radical pre-erythrocytic and erythrocytic clearance on subsequent rates of Plasmodium spp. infection and disease in children aged 5-10 years in a treatment to re-infection study design. In order the clear liver-stage/blood-stages G6PD-normal children were randomised to receive Chloroquine (3 days, standard dose) and Coartem (3 days, standard dose) plus either i) primaquine (20 days, 0.5mg/kg) or ii) placebo (20days). These drugs were administered over a period of 4 weeks.

In addition to this epidemiological data, the study will assess the natural acquisition of cellular and humoral immune responses to P. falciparum and P. vivax, thus assisting in the determination of correlates of clinical immunity to P. falciparum and P. vivax in PNG children aged 5-10 years.

These data will not only be essential for development of future vaccines against P. vivax and P falciparum but provide invaluable insight into the contribution of long-lasting liver-stages to the force of infection with P. vivax that will contribute towards designing more rational approaches to the treatment of P. vivax both in the context of case management and future attempts at elimination.
Study Started
Aug 31
Primary Completion
May 31
Study Completion
May 31
Last Update
May 21

Drug Primaquine

Drug Placebo

Sugar pills, appearance identical to Primaquine tablets

Drug Chloroquine

Drug Artemether Lumefantrine

  • Other names: Coartem

Primaquine Active Comparator

Primaquine, 0.5mg/kg/day, 20 days directly observed treatment Chloroquine, 25mg/kg total dose, divided over 3 days directly observed treatment Artemether-Lumefantrine, 3 days BD

Placebo Placebo Comparator

Placebo, 20 days directly observed treatment Chloroquine, mg/kg, 3 days directly observed treatment Artemether-Lumefantrine, 3 days BD


Inclusion Criteria:

aged 5-10 years (±3 months)
permanent residents of the area
absence of history of hypersensitivity reactions to the drugs

Exclusion Criteria:

chronic illness
severe malnutrition (weight-for-age nutritional Z score [WAZ] <60th percentile)
severe anemia (Hb <5 g/dL),
G-6-PD deficiency (<60% G-6-PD activity)
permanent disability, which prevents or impedes study participation. Any 1 or more of the criteria is sufficient to exclude study participation.
No Results Posted