Possible replacement of malaria mosquitoes

Sir,–The purpose of this letter is to draw the attention of research workers in control of mosquito colonies to the possible value of investigating the factors governing the infection of mosquitoes with parasites of human malaria. If a strain of a vector species could be isolated that has inability to become infective as a dominant characteristic, the way would be opened up to implant such mosquitoes in areas where the normal vectors of the same species have been reduced in numbers. There is the hope that they would breed and become locally predominant.