“As evidence mounts that head lice are developing resistance to widely used insecticides, the fight against lice is helped by a better understanding of how they spread—and how to stop them.
Controlled studies of transmission of head lice (Pediculus humanus capitis) in real-world settings aren’t exactly feasible, though, because the most accurate investigation would require somehow tracking the detailed movements of, say, a classroom full of children as well as the individual lice those children might be carrying. So, researchers must find different ways to get at the same kind of information.”