Some mosquito species transmit microbial
organisms that cause deadly diseases: malaria, encephalitis, yellow
fever, denghue fever (including the deadly hemoragic form), filariasis
and a large range of more rare diseases. Malaria alone affect 100
million a year and kill 1-2 millions yearly, most of them children
younger than 5.
Mosquito larvae live in water where they filter out organic particles
and bacteria. Two groups of mosquito larvae (Anopheles species responsible
first of all for malaria, Culex pipiens/quinquefasciatus responsible
for filariasis and several virus diseases, but also the major nuisance
mosquitoes in towns worldwide) feed at or just below the water surface.
breeding site - Africa
The bacterium Bacillus sphaericus specifically kills mosquito
larvae belonging to the groups given above (for more information
on this bacterium, click Bacillus sphaericus). Commercial products
existed already when we started working with a new formulation,
but these other products consisted of water suspensions of the bacterium
and organic left-over from the production process, and thus with
a poor ability to be stored in tropic countries without rotting
and loss of the useful bacterium.
breeding site - Burkina Faso
The bacterium is applied in its resting form,
the spore. Once applied in the water, the spores sink as they are
heavier than water. That limits the effect time of the product since
the mosquitoes eat at the water surface. If the bacteria could stay
at the surface, they would be killed by exposure to sunrays.
Our - patented - concept was therefore to develop a product that:
Contains no water thus more stable in the tropics
Floats thus remain where the mosquitoes are feeding
Sustained release thus compensate for the inevitable
continuous loss after application
Consist of food ware ingredients thus applicable
by hand making application equipment unnecessary and completely
safe since the bacterium itself present no danger to the health.
Simple to produce thus making laboratories or
small companies able to produce themselves and distribute locally
Skovmand O. and. Sanogo, E. 1999:
Comparsion of experimental formulations of Bacillus sphaericus and
B. thuringiensis israelensis against Culex quinquefasciatus and Anopheles
gambiae in Burkina Faso, J. Med. Entomol. 36:62-67.
Skovmand O. and Bauduin, S. 1997. Effect of granular formulation of
Bacillus sphaericus against Culex quinquefasciatus and Anopheles gambiae
in Vestafrican countries, J. Vector Ecology 22: 43-51