In a seminal study, Reed and his team used modern lice DNA to trace the origin of clothing use back to around 170,000 years ago. According to Reed, this was a game-changing moment for our ancestors.

secondary outcomes were absence of live head lice on days 2 and 8 and—for patients in the extension stage—on days 22 and 29. Overall, 376 households with 812 patients were enrolled.