KILLING mosquitoes of the genus Anopheles, the sort that transmit malaria, is a serious business—so serious that some doctors would like to do it by using people as bait. Their idea is to dose those in malarious areas with a drug called ivermectin. This will not protect the dosees directly, for it does not act on the parasite that causes the disease. But it may protect them indirectly, by making their blood poisonous to Anopheles. Mosquitoes do not tend to fly far from the place they hatch, and experiments suggest that if most of a village’s inhabitants were to take ivermectin...
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