We are all aware of the Stinky Feet effect, in which human skin odors attract female anophelines in a dark bedroom. And to many of us, this suggests that we should wash our feet before going to bed.
Now, Mescher of ETH Zurich, De Moraes and others - in a recent article in Proc. of the National Academy - indicated that mice infected with Plasmodia are more attractive to anophelines than ordinary mice. SO
If this evolved as a durable trait in anopheline mosquitoes, it means it conferred either a survival advantage, or a reproductive advantage to the mosquito.
1. It is hard to see how it would give females a survival advantage to pick up an infection, but
2. It might easily give a reproductive advantage because it means the female mosquito has an extra signal to help her locate her bloodmeal in this dark room, and thus would lay eggs more often than females which could not find a meal.
It would be interesting to determine whether nightly washing of our feet would also take away the female mosquitoes advantage, and cause her to go hungry. Could foot-washing be as useful as a bednet?
And maybe a slight perfume made of neem tree oil or eucalyptus oil would be the clincher. Perfume instead of a repellent, because perfumes are attractive for people, although maybe repellent for mosquitoes. You never know!
Bill - an engineer