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Advocates of increased use of DDT in IRS claim that alternative insecticides are more expensive, more toxic, or not as effective.
As discussed above, susceptibility of mosquitoes to DDT varies geographically.
The same is true for alternative insecticides, so its relative effectiveness varies.
Toxicity and cost-effectiveness comparisons lack data.
Relative insecticide costs vary by location and ease of access, the habits of the local mosquitoes, the degrees of resistance exhibited by the mosquitoes, and the habits and compliance of the population, among other factors.
The choice of insecticide has little impact on the total cost of a round of spraying, since product costs are only a fraction of campaign costs.
IRS coverage needs to be maintained throughout the malaria season, making DDT's relatively long life an important cost savings.

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