Life Time Impregnation of Mosquito Bed Nets
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Dear All,
Allow me to inform you that we have now successfully concluded our
preliminary tests on our development of long lasting impregnation of
mosquito bed nets.
Our newly formulated and patented PermaNet(tm) impregnation is done
on polyester bed nets which fully comply with the specifications and
requirements of international organisations within aid and health.
The price of this net will remain the same as present market prices
for pre-impregnated nets, despite having a 5-fold increase in life
time as indicated in the time accelerated test below.
PermaNet(tm) has been tested by an international reference laboratory
according to WHO protocols. The laboratory is LIN from IRD (previ-
ously known as Orstom). Test results show that even after 21 washes
the net has a 100% "knock down" (KD) which is recognised by WHO as a
criteria of good efficiency. Standardized washing tests have been
performed for 20 min. at 30 degree C. using high concentration of
soap.
After 21 washes the details of the test results after 3 min. exposure
of malaria mosquitoes to PermaNet(tm) are the following:
Total number of mosquitoes exposed: 20
Total knock down after 60 min.: 20
% - 100
Effective deaths after 24 hrs.: 18
Functional: 18
Effective mortality %, after 24 hrs.: 90
Functional %: 90
We have used deltamethrin as this is one of the insecticides recom-
mended by WHOPES (WHO pesticide Evaluation Scheme) for treatment of
mosquito nets.
The life time impregnated PermaNet(tm) is by any standards the best
choice of mosquito bed nets. Most projects in Africa are under 10% in
re-treatment, but where you do 7 to 10 re-treatments your extra total
costs are likely to be at least 15 US$ per bed net.
The PermaNet(tm) does not need to be washed as often as other nets,
as a dirt-repellent product has been added.
The pre-impregnated PermaNet(tm) also minimizes the pollution and
hazards of re-impregnations in the field.
The present testing will of course continue, and we have no reason to
believe that our long life impregnation will not continue to reach
even higher peaks of durability. The reason why we go out and mention
it now is, that we feel we have passed the time of longevity that you
can call "Life Time Impregnation of Mosquito Bed Nets".
Please, do not hesitate to come back with questions and comments.
All the best,
TORBEN
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Torben Vestergaard Frandsen
Disease Control Textiles
Vestergaard Frandsen A/S
Akseltorv 4b 6000 Kolding, Denmark
Tel: +45-75-503-050
Fax: +45-75-503-044
mailto:TVF@vestergaard-frandsen.dk
http://www.vestergaard-frandsen.dk
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