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PMI: Presidents Malaria Initiative - Saving lives in Africa.

Indoor Residual Spraying (IRS)

  Photo of an IRS worker in Uganda.
  A sprayer practices his technique on a wall in Zanzibar during a training session, where IRS, in combination with other malaria control efforts, has contributed to a dramatic reduction in the number of confirmed cases of malaria in young children.
Source: Karie Atkinson/USAID

IRS, a proven and highly effective malaria control measure, involves the coordinated, timely spraying of the interior walls of homes with insecticides. Mosquitoes are killed when they rest on those walls. Sprayed houses are protected for about 4 to 10 months, depending on the insecticide used and the housing construction. The World Health Organization (WHO) has approved 12 insecticides it considers effective and safe for use in IRS, including DDT. The choice of insecticide depends on its registration status in country, the housing construction (e.g., mud, brick, or wood), the duration of the malaria transmission season, and susceptibility of local Anopheles mosquitoes to the insecticide.

PMI has supported IRS activities in all 15 focus countries. PMI activities include assessing the environment to ensure safe and effective use of insecticides, educating residents about the benefits of IRS, training spray teams, procuring insecticide and equipment, and developing and evaluating spraying activities.



Web Resources

IRS Training Modules

  1. PMI IRS Overview
  2. Pesticide storage stock control transportation
  3. Spraying Techniques
  4. Waste Management
  5. DDT OP Special Considerations
  6. Field Visits