QUESTION

How are the Anopheles mosquitoes able to transmit human Malaria and others are not? What makes them different from the other genus of mosquito?

ANSWER

This is a great question and in fact scientists are not really sure of the answer. The ability of female Anopheles to transmit malaria is a quirk of evolutionary history. Other species of Plasmodium (the Latin genus name of the group of parasites which cause malaria), for example those that infect birds and lizards, are transmitted by other mosquitoes, such as Culex. When the parasite switched hosts and started infecting mammals, this coincided with the parasite specializing in infecting Anopheles mosquitoes, and this relationship has remained ever since. It is a case of what scientists term “coevolution”, where a parasite and its vector have a tightly coupled and highly specialized relationship.