Dengue vector management using insecticide treated materials and targeted interventions on productive breeding-sites in Guatemala

Table 4 Insecticide bioavailability and chemical residuals of PermaNet 2.0 curtains and drum covers used in Poptun, Guatemala, over a period of 18 months /March 2009 to October 2010

Type of ITM and months of use	No. Aedes females/replicate	Abbot corrected 24 h mortality (%)	No. ITM samples	HPLC (mg/m² ± SD)
3 months (Curtains)	5	100	10	54.7 (30.1)
12 months (curtains)	5	100	10	53.9 (20.7)
18 months (curtains)	5	100	10	64.9 (16.6)
3 months (drum covers)	5	100	5	--
18 months (drum covers)	5	85.3	10	--

(The activity of deltamethrin was assessed by the WHO standard cone test. Batches of females of the Liverpool strain (susceptible) were exposed for 3 minutes to different samples of the netting materials and mortality rate after 24 h was recorded. The chemical analysis of the residuals was performed by HPLC. Both assays were carried out at the Liverpool School of Tropical Medicine, UK). Great Britain.
* 30 female Aedes mosquito controls exposed to un-treated nets for each experiment (see text).