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Thawer, Narjis G, Ngondi, Jeremiah M, Mugalura, Frances E, Emmanuel, Isaac, Mwalimu, Charles D, Morou, Evangelia, Vontas, John, Protopopoff, Natacha, Rowland, Mark, Mutagahywa, Joshua, Lalji, Shabbir, Molteni, Frabrizio, Ramsan, Mahdi M, Willilo, Ritha, Wright, Alexandra, Kafuko, Jessica M, Ndong, Isaiah, Reithinger, Richard and Magesa, Stephen Masingili (2015) 'Use of insecticide quantification kits to investigate the quality of spraying and decay rate of bendiocarb on different wall surfaces in Kagera region, Tanzania'. Parasites & Vectors, Vol 8, Issue 242.
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Par_Vec_8_242_Use of insecticide quantification kits.pdf - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview |
Abstract
Background
Bendiocarb was introduced for the first time for Indoor Residual Spraying (IRS) in Tanzania in 2012 as part of the interim national insecticide resistance management plan. This move followed reports of increasingly alarming levels of pyrethroid resistance across the country. This study used the insecticide quantification kit (IQK) to investigate the intra-operational IRS coverage and quality of spraying, and decay rate of bendiocarb on different wall surfaces in Kagera region.
Methods
To assess intra-operational IRS coverage and quality of spraying, 104 houses were randomly selected out of 161,414 sprayed houses. A total of 509 samples (218 in Muleba and 291 in Karagwe) were obtained by scraping the insecticide samples from wall surfaces. To investigate decay rate, 66 houses (36 in Muleba and 30 in Karagwe) were selected and samples were collected monthly for a period of five months. Laboratory testing of insecticide concentration was done using IQKTM [Innovative Vector Control Consortium].
Results
Of the 509 samples, 89.5% met the World Health Organization (WHO) recommended concentration (between 100–400 mg/m2) for IRS target dosage. The proportion of samples meeting WHO standards varied between Karagwe (84.3%) and Muleba (96.3%) (p < 0.001). Assessment of quality of spraying at house level revealed that Muleba (84.8%) had a significantly higher proportion of households that met the expected target dosage (100–400 mg/m2) compared to Karagwe (68.9%) (p < 0.001). The quality of spraying varied across different wall substrates in both districts. Evaluation of bendiocarb decay showed that the proportion of houses with recommended concentration declined from 96.9%, 93.5% and 76.2% at months one, two, and three post IRS, respectively (p-trend = 0.03). The rate of decay increased in the fourth and fifth month post spraying with only 55.9% and 26.3% houses meeting the WHO recommendations, respectively.
Conclusion
IQK is an important tool for assessing IRS coverage and quality of spraying. The study found adequate coverage of IRS; however, residual life of bendiocarb was observed to be three months. Results suggest that in order to maintain the recommended concentrations with bendiocarb, a second spray cycle should be carried out after three months.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Insecticide quantification kit; Bendiocarb; Indoor residual spraying; Residual life; IRS coverage; Quality of spraying; Tanzania |
| Subjects: | WA Public Health > Preventive Medicine > WA 240 Disinfection. Disinfestation. Pesticides (including diseases caused by) WA Public Health > Health Problems of Special Population Groups > WA 395 Health in developing countries WC Communicable Diseases > Tropical and Parasitic Diseases > WC 765 Prevention and control |
| Faculty: Department: | Biological Sciences > Department of Tropical Disease Biology |
| Digital Object Identifer (DOI): | https://doi.org/10.1186/s13071-015-0859-5 |
| Depositing User: | Jessica Jones |
| Date Deposited: | 28 Jan 2016 10:39 |
| Last Modified: | 06 Feb 2018 13:11 |
| URI: | https://archive.lstmed.ac.uk/id/eprint/5552 |
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