Combating Dengue With Innovative, Paradigm-shift-Strategies: Early Dengue Surveillance in Adult Aedes Mosquitoes
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|ClinicalTrials.gov Identifier: NCT03799237|
Recruitment Status : Recruiting
First Posted : January 10, 2019
Last Update Posted : January 10, 2019
|Condition or disease||Intervention/treatment||Phase|
|Dengue||Other: GOS trap and dengue NS1 antigen kit||Not Applicable|
This cluster randomised controlled trial will be conducted to provide evidence on the efficacy of an integrated active vector surveillance and preventive strategy in the community. It aims to demonstrate effectiveness of a new proactive paradigm in reducing dengue epidemics. The main hypotheses are 1) This new paradigm (GOS trap and dengue NS1 kit for detection of dengue in Aedes) will reduce dengue epidemics compared to the usual current vector surveillance/control carried out by the Ministry of Health. 2) Community will be more receptive to this new surveillance activity as they will receive information of dengue transmissions before dengue cases are reported.
The study sites at PJU10, Damansara Damai, Petaling Jaya, Selangor, Malaysia are
- Intervention arm: Harmoni Apartment, Impian Apartment, Park Avenue Condominium, and Suria Shop Apartment
- Control arm: Permai Apartment, Lestari Apartment, Indah Apartment, and Vista Shop Apartment
Activities to be carried out include:
A. Questionnaire survey and blood taking for dengue seroprevalence among residents from both arms When people in the community are gathered at an identified, suitable area, the Knowledge, Attitude and Practice (KAP) questionnaires will be distributed for them to answer. After the questionnaire survey, about 3 ml of venous blood would be taken by trained personnel for dengue IgG and IgM serology.
B. Placement of the GOS mosquito trap in the intervention arm The GOS mosquito traps will be placed in the intervention arm and serviced weekly. The trapped Aedes mosquitoes would be checked for dengue virus via dengue NS1 rapid diagnostic test kit.
The GOS mosquito traps will also be placed randomly in the control arm once per month for entomological survey.
C. If a dengue-positive mosquito is found, flyers and banners will be distributed and hung to inform the residents of the presence of dengue transmission in the apartment block/apartment. Alternatively, the residents may also be approached house-to-house or an educational booth set up at strategic locations in the apartment to warn and educate the residents.
D. The KAP questionnaire survey will be carried out again 3 months before the completion of the trial in the intervention arm to gauge the communities' perception of this intervention.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||7979 participants|
|Intervention Model:||Parallel Assignment|
|Intervention Model Description:||Cluster Randomized Controlled Trial|
|Masking:||None (Open Label)|
|Official Title:||Cluster Randomized Controlled Trial: Efficacy of Gravid Oviposition Sticky Trap (GOS) and Dengue NS1 Antigen Rapid Diagnostic Test for Early Surveillance of Dengue Among Adult Aedes Mosquitoes to Reduce Dengue Outbreaks in PJU10, Damansara Damai, Selangor, Malaysia|
|Actual Study Start Date :||October 1, 2018|
|Estimated Primary Completion Date :||March 31, 2020|
|Estimated Study Completion Date :||April 30, 2020|
Experimental: GOS trap and dengue NS1 antigen kit
Gravid Oviposition Sticky (GOS) traps will be placed to trap adult Aedes mosquitoes and changed weekly. NS1 will be used to detect dengue in trapped Aedes mosquitoes. When dengue NS1 positive mosquitoes are found, community will be alerted via flyers, banners and other means. Routine Aedes/dengue control and surveillance will be carried out as usual as per the current Ministry of Health guidelines.
Other: GOS trap and dengue NS1 antigen kit
The GOS trap lure and sticky surfaces to trap gravid Aedes mosquitoes. Three GOS traps will be placed on every 3 floors of the residential blocks. The traps will be changed weekly. Trapped Aedes mosquitoes will be identified to species. The mosquitoes will then be dissected, to remove the abdomen from the thorax. Five to seven abdomens of the same mosquito species will be pooled and tested for dengue NS1 antigen using the SD Biosensor Standard Q dengue NS1 antigen test kit. If the pool is tested positive for dengue NS1, the head and thorax of the respective abdomens will be subjected to the same procedure for dengue NS1 antigen test, individually. This may allow us to identify a focus where there could be dengue-infected individuals. Flyers/Posters will be disseminated besides, house-to-house approach to inform the residents of the findings and apartment blocks where these mosquitoes were found. The apartment management will also make use of social media disseminate this information.
No Intervention: Control
The GOS traps will be placed randomly in the control arm once per month for entomological survey. Routine Aedes control and surveillance will be carried out as per the current Ministry of Health guidelines. Dengue control measure will be initiated by the health authorities when human cases are reported from this arm.
- Change in number of weekly notified dengue cases in intervention arm [ Time Frame: Assess weekly, through study completion, 1 and a half years ]The number of notified dengue cases in the study sites will be obtained from the District Health Office
- Change in the duration of dengue outbreaks in intervention arm [ Time Frame: Through study completion, an average of 1 and a half years ]The duration of dengue outbreaks in the study sites will be obtained from the District Health Office.
- Change in adult Aedes density in the intervention arm [ Time Frame: Assess weekly, through study completion, within 1 and half years. ]Based on the weekly trap index
- Change in level of dengue Knowledge, Attitude and Practice in the intervention arm [ Time Frame: 6 months after recruitment for pre-trial questionnaire survey. 3 months after recruitment for post-trial questionnaire survey, through study completion, 1 and a half years ]The mean of the percentage score of the population for each domain (knowledge & attitude/practises) will be determined for the pre- and post-test. Then, paired t-test will be performed to determine the presence of significant changes in both means (An increase in score percentage indicate a better outcome). Additionally, an individual percentage score of 80% and above indicates indicates good knowledge/attitude/practice.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03799237
|Contact: Jonathan WK Liew, PhDfirstname.lastname@example.org|
|Contact: Sivaneswari Selvarajoo, BScemail@example.com|
|Petaling Jaya City Council||Recruiting|
|Petaling Jaya, Selangor, Malaysia|
|Contact: Poo Soon Ong, Master|
|Principal Investigator:||Jonathan WK Liew, PhD||University of Malaya|
|Study Director:||Indra Vythilingam, PhD||University of Malaya|