Short and long term evaluation of the efficiency of PermaNet® 2.0 bed net against environmental factors and washing using bioassay tests

  • Mohammad Hassan Kayedi Lorestan University; School of Medicine; Department of Parasitology and Mycology
  • Kiumars Khamisabadi Iran National Institute of Health Research
  • Ali Akbar Haghdoost Kerman University of Medical Sciences; Institute for Futures Studies in Health; Modeling in Health Research Center
  • Zohreh Kayedi Shiraz University; School of Pharmacy
  • Shirzad Fallahi Lorestan University; School of Medicine; Department of Parasitology and Mycology
  • Nargess Abdali Pasteur Institute of Iran; North Research Center
Keywords: Anopheles, Bioassay tests, Insecticide-treated bed nets, Malaria

Abstract

The aim of the present study was to examine the resistance of PermaNet® 2.0 bed nets against repeated washing and environmental factors by using bioassay tests. After 5, 15 and 21 washings with detergents and by using bioassay tests, the resistance of 40 PermaNet® 2.0 bed nets was compared with that of 40 bed nets conventionally treated with one K-O tablet. To examine the long-term resistance, 31 PermaNet® 2.0 bed nets were also distributed among villagers, and were re-collected to perform bioassay tests after 1, 2 and 5 years. In the first phase of this study, the insecticidal effect of the conventionally-treated nets significantly decreased due to repeated washings (P < 0.001); however, it was not significant regarding PermaNet® 2.0 bed nets (P = 0.92 in continuous exposure and P = 0.12 in mortality tests). In the long-term phase of this study, the time required for knockdown of PermaNet® 2.0 increased over the first 2 years and then decreased. In addition, the mortality rate decreased over the first 2 years and then increased. In conclusion, it seems that the technique used by the manufacturer for impregnation of PermaNet® 2.0 bed nets has an acceptable efficiency in comparison with conventional techniques.

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Published
2017-01-01
How to Cite
Kayedi, M., Khamisabadi, K., Haghdoost, A., Kayedi, Z., Fallahi, S., & Abdali, N. (2017). Short and long term evaluation of the efficiency of PermaNet® 2.0 bed net against environmental factors and washing using bioassay tests. Revista Do Instituto De Medicina Tropical De São Paulo, 59, e18. Retrieved from https://www.revistas.usp.br/rimtsp/article/view/131369
Section
Original Articles