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Parasit Vectors. 2015 Apr 22;8:242. doi: 10.1186/s13071-015-0859-5.

Use of insecticide quantification kits to investigate the quality of spraying and decay rate of bendiocarb on different wall surfaces in Kagera region, Tanzania.

Author information

1
RTI International, Dar es Salaam, Tanzania. narjis.thawer@gmail.com.
2
RTI International, Dar es Salaam, Tanzania. jngondi@rti.org.
3
Sengerema Health Institute, Sengerema, Tanzania. eradiusmugalurafrances@gmail.com.
4
ACDI/VOCA, Morogoro, Tanzania. tz.isaac@gmail.com.
5
National Malaria Control Programme, Dar es Salaam, Tanzania. dismasi@yahoo.com.
6
Liverpool School of Tropical Medicine, Liverpool, UK. emorou@biology.uoc.gr.
7
Department of Biology, University of Crete, Heraklion, Greece. emorou@biology.uoc.gr.
8
Faculty of Crop Science, Pesticide Science Lab, Agricultural University of Athens, 11855, Athens, Greece. vontas@imbb.forth.gr.
9
Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece. vontas@imbb.forth.gr.
10
London School of Hygiene and Tropical Medicine, London, UK. Natacha.Protopopoff@lshtm.ac.uk.
11
London School of Hygiene and Tropical Medicine, London, UK. Mark.Rowland@lshtm.ac.uk.
12
RTI International, Dar es Salaam, Tanzania. mmutagahywa@yahoo.com.
13
RTI International, Dar es Salaam, Tanzania. slalji@nb.rti.org.
14
Swiss Tropical and Public Health Institute, Dar es Salaam, Tanzania. fabrizio.molteni@netcell.org.
15
RTI International, Dar es Salaam, Tanzania. mmohamed@rti.org.
16
RTI International, Dar es Salaam, Tanzania. rwillilo@nb.rti.org.
17
London School of Hygiene and Tropical Medicine, London, UK. Lauren.Wright@lshtm.ac.uk.
18
United States Agency for International Development, Abuja, Nigeria. jkafuko@usaid.gov.
19
RTI international, Research Triangle Park, North Carolina, USA. indong@rti.org.
20
RTI international, Washington, DC, USA. reithinger@rti.org.
21
RTI International, Dar es Salaam, Tanzania. smagesa@rti.org.

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 IQK(TM) [Innovative Vector Control Consortium].

RESULTS:

Of the 509 samples, 89.5% met the World Health Organization (WHO) recommended concentration (between 100-400 mg/m(2)) 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/m(2)) 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.

PMID:
25896604
PMCID:
PMC4424830
DOI:
10.1186/s13071-015-0859-5
[Indexed for MEDLINE]
Free PMC Article

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