Malaria
Conditions
Brief summary
Twenty-four (24) clusters, each containing between 250-300 houses were selected throughout Bioko Island to be sprayed with either a long lasting pyrethroid insecticide, K-Othrine SC 62.5, or a bendiocarb insecticide, FICAM. Parasite prevalence in children aged 2-14 was measured before and after the application of insecticide.
Detailed description
In 2013, a new long lasting pyrethroid insecticide, K-Othrine SC 62.5, that has been developed by Bayer AG, was used for the IRS program in Bioko Island, Equatorial Guinea, for the first time. This change coincided with a marked increase in parasite prevalence in 2-14 year olds as measured in the Annual Malaria Indicator Survey (14% to 28%, respectively). In order to determine whether the change in insecticide caused the increase in prevalence, a cluster randomized control trial was designed. Twenty-four (24) clusters, each containing between 250-300 houses were selected throughout Bioko Island. Clusters were chosen with an attempt to maximize the geographical space between clusters (to minimize possible residual effects from insecticides), while ensuring that areas with historically higher acceptance rates for Indoor Residual Spraying (IRS) were selected. Each cluster had a buffer zone of 300m (or halfway between clusters less than 600m apart). A team of 10 local surveyors conducted a baseline survey in each cluster area, measuring prevalence through malaria Rapid Diagnostic Test (RDT) positivity, net ownership, spray coverage, and hemoglobin levels. Approximately 100 children in each cluster were tested. These data were then used for a restricted randomization. Each cluster was then sprayed with either deltamethrin or bendiocarb, depending on randomization. The IRS team put equal amount of effort into each cluster, as determined by number of sprayers/house/day in an attempt to minimize bias. An end-line survey was conducted using an ODK Collect application in the same cluster areas. Prevalence was measured by RDT, and hemoglobin data was gathered. In addition, the head of household was asked about the acceptability to IRS and their willingness to receive the insecticide in a future round.
Interventions
OTHERIRS: bendiocarb
carbamate insecticide
OTHERIRS: deltamethrin
Pyrethroid insecticide
Sponsors
London School of Hygiene and Tropical Medicine
Medical Care Development, Inc.
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
2 Years to 14 Years
Healthy volunteers
Yes
Inclusion criteria
* Children between 2-14 years old who reside in a household within the intervention area * Household clusters chosen among those with historically high IRS acceptance rate * Household clusters chosen to maximize distance between clusters.
Exclusion criteria
* Areas with historically high rates of refusing IRS
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Prevalence of falciparum infection in 2-14 year olds | 3-5 months post receiving IRS | Cross sectional Rapid Diagnostic Test (RDT)-based prevalence of infection of P.falciparum in children between the ages of 2 and 14 of the participating localities. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Prevalence of infection, adjusted for potential cofounders in 2-14 year olds | 3-5 months post receiving IRS | \- RDT-based prevalence of infection in children between the ages of 2 and 14 of the participating localities, adjusted for potential confounders, such as bednet use, socio-economic status, age of subjects etc. |
| Severe anemia in children under 5 | 3-5 months post receiving IRS | \- Severe anaemia prevalence (haemoglobin\< 8 g/dL) in children under 5 years of age of the participating localities. |
Outcome results
None listed