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  • Andrew Jones

Indoor Residual Spraying – A key element of Integrated Vector Management

Malaria continues to be one of the deadliest diseases in the world, killing hundreds of thousands of people every year. While great strides have been made in reducing its impact, it remains a serious public health threat. In this blog post, we discuss Indoor Residual Spraying (IRS) and how it is seen as a cornerstone of any integrated vector control programme.

IRS involves the spraying of insecticides, such as DDT or pyrethroids, on indoor surfaces to kill mosquitoes when they land on the sprayed surface. This method has been proven to be effective in reducing malaria transmission and saving lives. Studies by the World Health Organisation (WHO) have shown that IRS can reduce malaria cases by 50-90% if used as a part of an integrated vector control programme combined approach.

Whilst IRS is a cornerstone process in the fight to prevent malaria, IRS is not a standalone solution. It should be used in combination with other methods, such as larviciding (targeting mosquito breeding sites), fogging, bed nets, and using personal protection lotions. This integrated approach has been shown to have the greatest impact on reducing malaria transmission.

One important aspect of IRS is proper implementation and monitoring. Indoor surfaces must be sprayed according to a professionally designed plan and the insecticides must be reapplied in accordance with the schedule in the plan. Monitoring is important to ensure that mosquitoes are not developing resistance to the insecticides being used.

Training Spray Operatives and providing community education are crucial to the success of IRS. Spray Operatives must be properly trained in the safe use and handling of insecticides, as well as how to effectively spray indoor surfaces.

While IRS has been controversial in past decades due to concerns about environmental impact and potential harm to humans, recent studies have shown that properly implemented and monitored IRS can have minimal adverse effects while effectively reducing mosquito-borne disease transmission. New formulations have greatly reduced this risk.

Community education can help address any concerns, or misunderstandings, about IRS and ensure that workers and those in the local communities understand the importance and benefits of this method when used in conjunction with long-lasting insecticide-impregnated bed nets.

As part of the overall plan, posters need to be placed in washrooms, public health buildings such as hospitals and clinics, dormitories, and other easily seen places. Posters need to be in the language of the local workforce, this may seem obvious but it is amazing how many times posters are placed in a non-native language.

In summary, Indoor Residual Spraying is a proven method for reducing mosquito-borne disease transmission, but it should be used as part of a comprehensive approach that includes larviciding, fogging, bed nets, and the use of personal protection lotions. Implementing a co-ordinates plan and monitoring its success, along with training and community education, will dramatically reduce malaria transmission by up to 95% according to WHO.

Regent Laboratories and their regional partners conduct surveys, design vector control plans and help your local people successfully implement an integrated vector control programme. They can provide correctly matched larvicides and insecticides, bed nets and lotions, and they provide all these services as complementary if products are bought from them.

For more information visit our website or WhatsApp Ashley on +27 72 292 7041 or email


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