AngloGold Ashanti instituted the integrated malaria control program with primary focus on Indoor Residual Spraying (IRS). Though the main focus is on Indoor Residual Spraying the malaria preventive program includes larval source management and environmental management.
Prompt diagnosis and treatment, surveillance, robust monitoring and evaluation and intensive community sensitization are also deployed alongside the Indoor Residual Spraying to increase impact of the program.
Indoor Residual Spraying (IRS) is the application of Insecticide to the inside of dwellings, on wall and other surfaces that serve as resting places for malaria infected mosquitoes.
IRS is a proven and highly effective malaria control measure which interrupts transmission. It kills mosquitoes when they come in contact with treated surfaces, preventing disease transmission.
For IRS to be effective the vector (anopheles mosquito) must feed indoors and rest indoors. Female mosquitoes take blood to carry out egg production. Malaria vectors are mostly crepuscular (active during dawn and dusk) and nocturnal (active at night). Vectors avoid being dehydrated during the day by hiding in damp and cool places thus they are inactive during the day.
They bite at a time when the host is most vulnerable. Usually during these times their hosts are indoors sleeping or less active thereby reducing the risk of vectors being killed. It is based on this behaviour that the IRS approach to malaria control is employed.
Once a vector enters a room it perches on a wall, acclimatizes itself with the environment before biting an individual. If the wall is treated the vector will pick up residue of the insecticide on the wall (lethal dose) capable of paralysing the limbs and killing it eventually.
After the blood meal, the vector becomes too heavy to fly off; it therefore perches on the wall a second time to digest the blood and mature its eggs. After the digestion of the blood the vector then becomes light enough to fly off.
The two possible instances afford the vector the opportunity of picking up the lethal dose. The vector’s lifespan is shortened, so even if the host had the malaria parasite, the vector will not live long enough to incubate the parasite to the infective stage.
IRS hence prevents transmission of malaria by way of shortening the lifespan of the vector and thus reducing the vector population.
One advantage of Indoor Residual spraying is that a single spraying can protect a home for up to 9 months. Another is that the spraying requires no behavioural change that is after the spraying team has treated a dwelling, the occupiers can continue as before. You do not need to remember to do anything unlike the other preventive methods.
The IRS based intervention by AGAMal has made tremendous gains in the Obuasi Municipality and also in the entire upper West and Upper East regions. IRS has led to increase in productivity, reduced absenteeism in schools and has offered a healthier population.

Our Goal

To contribute to the reduction of diseases of public health importance, in line with national and international priorities.

E: info@agamal.org

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