Wrangling head lice, and the children they infest, must be up there with the most challenging duties a parent or caregiver has to face. And the job is getting harder. Commonly used chemical products ...

Head lice affect more than 100 million people worldwide annually. Permethrin (1% formulation) is efficacious but resistance is emerging. Malathion (0.5% formulation) is an alternative, but ...