- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00144716
Evaluation of Combined Use of ITN's and Insect Repellents Against Malaria
Clinical Evaluation of Combined Use of ITN's and Plant-based Insect Repellent Against Malaria in the Amazon
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
There is little doubt that the use of insecticide treated bed nets (ITN's) is one of the most successful means of reducing malaria in Africa. However, vectors in this region tend to be late night, indoor feeders. Vector species in other parts of the world may not be so susceptible to this form of vector control. In much of Central & Southern America, the major vectors such as An. darlingi and An. albitarsis have a feeding peak between 8 - 10pm, before most people retire to bed. Similarly, the major vector in much of S.E. Asia, An. dirus, seldom enters homes to feed. In these circumstances it is unlikely ITN's alone will provide adequate protection. Supplemental use of skin applied insect repellents may be an effective method of personal protection in the hours between dusk and retiring to bed. It would also prove useful for those individuals working late or moving early into the forest where exophagic species are encountered. As yet, there have been no robust clinical evaluations of combined ITN and repellent use. This double blind, placebo-controlled study is designed to evaluate the efficacy of combined ITN and plant based insect repellent use to reduce P. falciparum in the Bolivian Amazon in a region where ITN's alone are likely to be ineffective.
The study is a double-blind, placebo-controlled clinical evaluation. 1000 households will be used and 5 individuals age 10 + will be entered into the study from each. Recruitment will cover all rural communities in Vaca Diez and Pando Provinces, Department of Beni in the Bolivian Amazon Region, plus the outer 10 % of periurban districts of the 2 major towns in the region, Riberalta and Guayaramerin. A maximum of 20 % of households in any one location will be used, thus avoiding any effect of diversion of insects from treatment to placebo homes. Likewise, each house used will be a minimum of 25m from any other in the study. Baseline surveys will be conducted on each individual and informed written consent will be collected. Treatment (30 % L.E.) / placebo (0.1 % clove oil in alcohol) marked A or B will be allocated (50:50) at random, and all individuals in both groups will be provided with an ITN. Compliance questionnaires, collection of old bottles and distribution of fresh bottles will be conducted every 4 weeks. Everyone will receive personal instruction on how to apply repellent to arms & legs each evening at dusk and left a pictorial instruction sheet on how to measure 10 ml using the bottle lid. Compliance threshold will be set at 10% and monitored by measuring any residual product on collection and recording of nightly use. A more realistic measure of compliance will be gained through occasional evening spot checks of households by the local health workers. Finger prick blood samples will be collected at baseline and monthly throughout the study by trained & approved field staff. P. falciparum infection will be diagnosed by Paracheck® dipstick test, thus overcoming problems of recrudescence of P. vivax. Positive cases will be referred to the local health centre for treatment. The timing of the visits means the majority of malaria episodes will be detected as the Paracheck® test can detect antibodies in blood for around 3 weeks post treatment. In addition to the use of our monthly questionnaires, any episodes missed are highly likely to be recorded, as we are employing the same local health workers in each area, and blood slides are routinely taken at the local health centres. Outcome determination will constitute a series of monthly cross-sectional prevalence surveys, and, as positive cases are treated, this is equivalent to a measure of average prevalence of infection for each house.
Study Type
Enrollment
Phase
- Phase 3
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Written informed consent.
- Available for 4 x monthly follow ups.
- 5 or more individuals in household.
Exclusion Criteria:
- Allergy to repellents / plants.
- Malaria positive at baseline.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Double
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
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Reduction in cases of malaria
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Secondary Outcome Measures
Outcome Measure |
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Reduction in all-cause fevers
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Collaborators and Investigators
Investigators
- Principal Investigator: Nigel Hill, PhD, London School of Hygiene and Tropical Medicine
Publications and helpful links
Study record dates
Study Major Dates
Study Start
Study Completion
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- ITDCVG30
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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