Conditions: Plasmodium Falciparum Infection
Keywords: chloroquine, malaria, Plasmodium falciparum, Malawi, children
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 640
Healthy volunteers: no

Brief summary:
Malaria is a sickness caused by a germ that can get into a person's body when a mosquito bites them. It can cause fever, headache, body aches and weakness. It can even cause death, especially in children. When malaria is treated with the appropriate medicine(s), it can be cured completely. The purpose of this study is to find out if it is better to use chloroquine alone or in combination with another drug to most effectively treat malaria. About 640 children with malaria, aged 6 months to 5 years of age, from the Blantyre Malaria Project Research Clinic at the Ndirande Health Center in Malawi will be in the study. They will be treated with either chloroquine alone or a combination of chloroquine plus another medication (azithromycin or artesunate or atovaquone-proguanil) every time they get malaria for a year. Blood samples will be collected and tested at least every 4 weeks. Participants will be involved in the study for 1 year.

Detailed description:
Combination therapy is becoming the mainstay of malaria treatment. In general, the goal of combination therapy is to treat resistant infections successfully and to prevent the emergence and spread of resistance. The antimalarial combination therapies currently in use were not designed based on optimal pairing of drugs to deter the development and spread of parasite resistance to the individual partner drugs in settings of high malaria transmission. Careful studies are needed to identify the pharmacokinetic and pharmacodynamic properties of drug combinations that will deter resistance and prolong the useful therapeutic life of the next generation of antimalarial drug combinations. Current in vivo methods for measuring antimalarial drug efficacy in high-transmission areas use a 14 or 28-day follow-up period, but a single episode study misses several critical factors in assessing the efficacy and impact of antimalarial treatment. When follow-up is extended beyond 28 days, more cases of apparent resistance or treatment failure are found. Single-episode studies cannot assess the impact of therapy on the incidence of malaria over time. These limitations of standard in vivo studies have led the investigators to advocate longitudinal studies of drug efficacy. In addition to measuring efficacy of individual treatments, longitudinal studies measure sustained efficacy with repeated use of the same regimen over time, a scenario that more accurately reflects the real-life use of anti-malarial medication. The primary outcome of interest is the incidence of malaria episodes, as well as the secondary outcomes of anemia and severe malaria, are all highly relevant to public health policy-makers, as they reflect not only the burden of disease but also the utilization of health resources. Longitudinal studies also permit assessment of how pharmacokinetic properties of drugs affect the incidence of treatment episodes. This is a randomized, open-label, longitudinal drug efficacy trial. Participants will include 640 children, aged 6 months to 5 years, who are found to have uncomplicated malaria at the Blantyre Malaria Project Research Clinic at the Ndirande Health Centre in Blantyre, Malawi. After enrollment, participants will be randomized to one of four treatment arms: chloroquine alone or chloroquine in combination with artesunate, atovaquone-proguanil (AP), or azithromycin. The treatment outcome will be assessed through a standard 28-day efficacy study. Participants will subsequently be evaluated every 4 weeks and encouraged to return to the study clinic any time they are ill during the course of one year. If a new episode of uncomplicated malaria is diagnosed, the participant will receive the same therapy as assigned on enrollment. Polymerase chain reaction-corrected 28-day efficacy will be evaluated for each treatment episode. The primary study objective is to compare annual incidence of malaria clinical episodes. Secondary objectives are to: assess anti-malarial drug efficacy at first administration, by treatment arm; assess anti-malarial drug efficacy during subsequent episodes of malaria, by treatment arm; measure prevalence of chloroquine resistant parasites during the trial, by treatment arm; assess effect of each treatment arm on anemia at the end of study participation; assess safety of these drugs with repeated use; determine the chloroquine blood levels at which chloroquine sensitive and resistant parasites are able to cause infection; assess the effect of population movements on the risk of malaria infection; and assess the spatial patterns and the environmental determinants of malaria infection. Participants will be involved in study rela

Arms:
arm 1: N=160: treat with Chloroquine (CQ) alone. arm 2: N=160: treat with CQ plus atovaquone proguanil. arm 3: N=160: treat with CQ plus artesunate. arm 4: N=160: treat with CQ plus azithromycin.

Interventions: intervention 1: Atovaquone-proguanil intervention 2: Artesunate intervention 3: Azithromycin intervention 4: Chloroquine
Intervention descriptions: intervention 1: Atovaquone-proguanil: once a day for 3 days, Pediatric tablet: 62.5 mg/25 mg, Full strength tablet: 250 mg/100 mg intervention 2: Artesunate: 4mg/kg once a day for 3 days, 50 mg tablet intervention 3: Azithromycin 30 mg/kg once a day for 3 days, 200 mg/5cc suspension intervention 4: Chloroquine: 10 mg/kg on days 0 and 1, 5 mg/kg/day on day 2, 100 mg tablet.

Protocol document: