Malaria
Conditions
Keywords
Malaria, Cohort, Children, Epidemiology
Brief summary
The BLOOMy study is a longitudinal prospective cohort study of healthy children to assess the incidence of clinical malaria over the main transmission season. Participants will undergo baseline clinical and biological assessments then will receive a curative dose of either artesunate or dihydroartemisinin-piperaquine to clear any existing parasitemia. Clearance of parasites will be confirmed 3 weeks later by Polymerase chain reaction (PCR) and only participants with negative PCR will be definitively enrolled for the longitudinal follow up. Both active and passive case detection will be used to ensure that capture of a high proportion of infections in the cohort is achieved. Blood samples for immunological assessments will be obtained at Day 0 of each positive blood smear episode before treatment and at Weeks 4 post treatment. Participants will be followed for a minimum of six months throughout the malaria peak transmission season.
Detailed description
The BLOOMy study has two co-Primary objectives: * To assess the incidence of clinical malaria meeting the primary case definition in children aged 1.5 to 12 years living in the study area over the main transmission season * To assess the occurrence of reinfection following the radical cure of existing parasitemia. The secondary objectives are: * To assess the incidence of clinical malaria meeting various secondary cases definition in children aged 1.5 to 12 years living in the study area over the main transmission season * To measure the immune responses (humoral and cell-mediated) to a panel of malaria vaccine candidate antigens * To assess the molecular force of infection * To pilot and standardize malaria morbidity assessment in three phase 2 malaria vaccine testing sites.
Interventions
None listed
Sponsors
Groupe de Recherche Action en Sante
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Months to 12 Years
Inclusion criteria
* Healthy children aged 1.5 to 12 years * Residence in the study area or surroundings for the period of the study * Written informed consent from parents/legally acceptable representatives and an assent for children
Exclusion criteria
* Complicated symptomatic malaria (defined according to standard World Health Organization criteria) * Anaemia (Hb\<8g/dL), * Any (chronic) illness that requires immediate clinical care. * Family history of sudden death or of congenital or clinical conditions known to prolong QTcB or QTcF interval or e.g. family history of symptomatic cardiac arrhythmias, with clinically relevant bradycardia or severe cardiac disease * Any treatment which can induce a lengthening of QT interval * Known history of hypersensitivity or allergic reactions to piperaquine or other aminoquinolones * Receipt of any blood transfusion or immunoglobulins within 3 months * Known history of hypersensitivity or allergic reactions to artesunate * Severe malnutrition (weight-for-height being below -3 standard deviation or less than 70% of median of the World Health Organization (WHO) normalized reference values). * Weight below 5 kg * Current or previous participation in malaria vaccine trials * Current active participation in any trial involving administration of investigational drug.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Number of clinical malaria episodes per child-year at risk meeting the primary case definition | 6 months | The primary case definition: Positive P. falciparum parasitemia at a density \> 0 detected by microscopy associated with measured fever (Axillary temperature ≥37.5°C/Tympanic ≥38°C or Forehead temperature ≥37.5°C using non-contact infrared thermometer)) |
| Time to P. falciparum infection detected by positive thick blood smear within 6 months after the enrolment in African children under natural exposure to P. falciparum by treatment group | 6 months | — |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Number of new P. falciparum clones acquired over time | 6 months | — |
| Number of clinical malaria episodes per child-year at risk meeting the following secondary cases definition | 6 months | Second Secondary case definition: Measured fever (Axillary temperature ≥37.5°C/Tympanic ≥38°C or Forehead temperature ≥37.5°C using non-contact infrared thermometer) AND parasitemia of \>5,000 parasites (p) / μl |
| Immune responses to malaria candidate vaccines in the consortium portfolio | 6 months | Panel of malaria vaccine candidate's antigens such as PfSPZ CVAC, ME-TRAP, R21 (Pre erythrocytic stage antigens) and PfRH5, NPC-SE36 (Blood stage antigens) will be used to assess antibody responses at day 0 and 28 of confirmed episodes of clinical malaria. |
Countries
Burkina Faso
Outcome results
None listed