OK,I have no trouble accepting that.But am I correct to suspect that the vector of these diseases will,over time,develop a resistance to the DDT thus putting the people of various tropical regions right back where they started?
Posing that question is the closest I came to objecting to the use of DDT in malaria hot spots.
"But am I correct to suspect that the vector of these diseases will,over time,develop a resistance to the DDT thus putting the people of various tropical regions right back where they started?"
Your question pre-supposes that some individuals will survive, develop limited or total immunity and pass it on genetically. I don't believe that any individuals, in significant numbers, survive. Hence, no passing on of survivability genes.