Community effectiveness of indoor spraying as a dengue vector control method: A systematic review

Abstract

BackgroundThe prevention and control of dengue rely mainly on vector control methods, including indoor residual spraying (IRS) and indoor space spraying (ISS). This study aimed to systematically review the available evidence on community effectiveness of indoor spraying.MethodsA systematic review was conducted using seven databases (PubMed, EMBASE, LILACS, Web of Science, WHOLIS, Cochrane, and Google Scholar) and a manual search of the reference lists of the identified studies. Data from included studies were extracted, analysed and reported.ResultsThe review generated seven studies only, three IRS and four ISS (two/three controlled studies respectively). Two IRS studies measuring human transmission showed a decline. One IRS and all four ISS studies measuring adult mosquitoes showed a very good effect, up to 100%, but not sustained. Two IRS studies and one ISS measuring immature mosquitoes, showed mixed results.ConclusionsIt is evident that IRS and also ISS are effective adulticidal interventions against Aedes mosquitoes. However, evidence to suggest effectiveness of IRS as a larvicidal intervention and to reduce human dengue cases is limited–and even more so for ISS. Overall, there is a paucity of studies available on these two interventions that may be promising for dengue vector control, particularly for IRS with its residual effect.

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: results from a prospective dengue surveillance study in Machala, Ecuador

“…In a recent review of indoor residual spraying (IRS) and indoor space spraying (ISS), the authors found that there is evidence of a reduction in Ae. aegypti densities, but there is limited evidence of the effects on DENV infections [54]. In our study, 37.9% of participants reported fumigation inside the house as a preventive action, but we did not distinguish between fumigation by the MOH versus by the household members themselves.…”

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: Results from a prospective dengue surveillance study in Machala, Ecuador

“…In a recent review of studies that evaluated the impacts of IRS and indoor space spraying (ISS), the authors found evidence of a reduction in Ae . aegypti densities, but they found limited evidence of a reduction in DENV infections [ 56 ]. This points to the need for additional studies to evaluate the impact of IRS and ISS on DENV infections.…”

Evaluation and Comparison of Spray Equipment for Indoor Residual Spraying

“…Motorized equipment is currently being used for indoor spraying (Stoddard et al 2014, Samuel et al 2017, Gunning et al 2018, whereby insecticide applied at ultra-low volume (ULV) with portable equipment is implemented indoors as a rapid approach to contain an outbreak. Such methods provide a rapid, albeit transient, impact on indoor populations of adult mosquitoes (Stoddard et al 2014, Samuel et al 2017. We show that similar motorized equipment can deliver the appropriate droplet size required for TIRS, provided they are fitted with CFVs.…”

“…Indoor residual spraying (IRS) is the application of long-lasting residual insecticides to the walls, eaves, and ceilings of houses or structures, targeting vectors that land or rest on these surfaces (WHO 2006(WHO , 2007(WHO , 2015. Although widely used in malaria, Chagas disease, and leishmaniasis control (WHO 2006(WHO , 2007(WHO , 2010, IRS implementation in control of urban Aedes aegypti (L.) has suffered from limited evidence of its efficacy (Bowman et al 2016, Vazquez-Prokopec et al 2017a and the challenge of scaling up interventions within large city environments (Paredes-Esquivel et al 2016, Samuel et al 2017, Hladish et al 2018, Paz-Soldán et al 2018. Recent evidence from Cairns, Australia, indicates that IRS targeting Ae.…”