Long-Term Insecticidal Activity and Physical Integrity of Olyset Nets in Tafea Province, Vanuatu

Dutta, Shurajit N., Amon, James, Iata, Harry, Cooper, Robert D. and Russell, Tanya L. (2014) Long-Term Insecticidal Activity and Physical Integrity of Olyset Nets in Tafea Province, Vanuatu. Journal of Medical Entomology, 51 1: 164-169. doi:10.1603/ME13143

Author Dutta, Shurajit N.
Amon, James
Iata, Harry
Cooper, Robert D.
Russell, Tanya L.
Title Long-Term Insecticidal Activity and Physical Integrity of Olyset Nets in Tafea Province, Vanuatu
Journal name Journal of Medical Entomology   Check publisher's open access policy
ISSN 0022-2585
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1603/ME13143
Open Access Status DOI
Volume 51
Issue 1
Start page 164
End page 169
Total pages 6
Place of publication Lanham, MD United States
Publisher Entomological Society of America
Language eng
Formatted abstract
The long-term efficacy of long-lasting insecticidal nets (LLINs) depends on both the physical condition of the net and the residual activity of the insecticide. This study focused on monitoring these parameters in Olyset nets (Sumitomo Chemical Co., Osaka, Japan) (n = 101) that had been used for 1–3 yr in Tafea Province, Vanuatu. Net usage and frequency of washing was ascertained by questionnaire; the nets were assessed with regards to cleanliness and damage owing to holes. Insecticide efficacy was determined with cone bioassays using Anopheles farauti Laveran. Net usage was high and 86.1% (87 of 101) of villages stated that they used the net every night. Washing of nets was low (11.9%, 12 of 101), and most nets (79.2%, 80 of 101) were considered dirty. Most nets were damaged (73.4% had holes), and 22.8% (23 of 101) had large holes (<200cm2).The24-h mortality of An. farauti exposed to nets aged 1–2 yr was 79.4%, while the mortality for nets 3 yr of age was significantly lower at 73.7%. There was no difference in the insecticidal activity of clean compared with dirty nets (mean 24-h mortality: Clean = 76.7%, Dirty = 77.1%). Although the majority of nets had holes, the physical condition of 8.9Ð22.8% of nets was altered so severely to potentially affect efficacy. Although the 3-yr-old nets would still be providing significant levels of insecticidal and personal protection, consideration should be given to replacing nets <3 yr old. 
Keyword Bednet
Physical integrity
Insecticide activity
Long lasting insecticidal net
Treated Bed Nets
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Public Health Publications
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