Short and Long Term Evaluation of the Efficiency of Permanet® 2.0 Bed Net Against Environmental Factors and Washing Using Bioassay Tests Publisher Pubmed



Kayedi MH¹ ; Khamisabadi K^{2, 3} ; Haghdoost AA⁴ ; Kayedi Z⁵ ; Fallahi S¹ ; Abdali N^{6, 7}
Source: Revista do Instituto de Medicina Tropical de Sao Paulo Published:2017

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. © 2017, Instituto de Medicina Tropical de Sao Paulo. All rights reserved.