Abstract
BackgroundLong-lasting insecticidal nets (LLINs) are the most favoured vector control tools worldwide. Timely monitoring and evaluation of LLINs is important to sustain the impact of this promising vector control method and for replacement of worn-out and those rendered ineffective. During the mid-2017, LLINs were distributed by the National Vector Borne Disease Control Programme (NVBDCP) in high malaria endemic districts of the eastern coastal state of Odisha. The study was carried out to assess the field performance of the LLINs post 30 months of distribution in Koraput district of Odisha state.MethodsA total of 130 households were randomly selected from three villages of Laxmipur CHC in Koraput district, Odisha, India; one each from hilltop, foothill and plain terrain. The net users were interviewed to elicit information on usage, washing practices, physical integrity, bio-efficacy and survivorship of LLINs to confirm the claimed three-year life of the LLINs.Results74.8% of the LLINs were physically present after 30 months of distribution. The numbers (%) of LLINs used previous night varied from 30 to 61% between study villages. 74% respondents were using the LLINs throughout the year and 26% only seasonally. Of the total, 85% of the nets were reported to be washed and 95% nets were dried under shade as recommended. Altogether, 58% of the surveyed nets were found torn with holes. Of these, 74 (57%) nets were in good condition, 10 (8%) nets were in serviceable and 45 (35%) nets were badly torn and needed replacement. A total of 45 (93.75%), 68 (80%) and 71 (63.8%) LLINs were physically present in hilltop, foothill and plain villages, respectively. The LLINs did meet the efficacy criteria, given the 100% mortality to the exposed Anopheles jeyporiensis mosquitoes post 30 months distribution.ConclusionsThe findings of this study were communicated to the programme officials of the state and LLINs were replenished soon after 31st month post-distribution of LLINs.
Highlights
Long-lasting insecticidal nets (LLINs) are the most favoured vector control tools worldwide
Sixty-four (49%) respondents told that they slept under LLINs during the previous 7 days whereas 53 (41%) people admitted that LLIN was not used during last 7 days
The mass distribution of LLINs, there was a marked decline in malaria incidences in the district as well as in the state and the malaria control programme exceeded the national target of 80% reduction in malaria morbidity and mortality within one and half years by the end of 2018 [18]
Summary
Long-lasting insecticidal nets (LLINs) are the most favoured vector control tools worldwide. Mass distribution of long-lasting insecticidal nets (LLINs) in India follows a worldwide established successful strategy for control of malaria [1, 2]. Questions have arisen about whether LLINs retain the durability (survivorship, fabric integrity and bio-efficacy) up to 3 years in different eco-epidemiological settings, where LLINs are distributed with universal coverage by the malaria control programme in different countries [4]. The World Health Organization (WHO) recommends countries to monitor by quantifying three indicators: survivorship, fabric integrity and bio-efficacy to assess durability of LLINs following the mass distribution campaigns [5, 6]
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