Page "DDT" Paragraph 46

However, a study in Thailand found the cost per malaria case prevented of DDT spraying ($ 1. 87 US ) to be 21 % greater than the cost per case prevented of lambda-cyhalothrin – treated nets ($ 1. 54 US ), at very least casting some doubt on the unexamined assumption that DDT was the most cost-effective measure to use in all cases.

The director of Mexico's malaria control program finds similar results, declaring that it is 25 % cheaper for Mexico to spray a house with synthetic pyrethroids than with DDT.

However, another study in South Africa found generally lower costs for DDT spraying than for impregnated nets.