But only for indoor spraying: > WHO recommends DDT only for indoor residual spraying. Countries can use DDT for as long as necessary, in the quantity needed, p

But only for indoor spraying: > WHO recommends DDT only for indoor residual spraying. Countries can use DDT for as long as necessary, in the quantity needed, provided that the guidelines and recommendations of WHO and the Stockholm Convention are all met... The article I linked to discusses indoor spraying and supports it. They argue though that the primary use of DDT in Africa has been agricultural spraying, which is why the resistance formed (and which is what most people oppose).