Permethrin (1% formulation) is efficacious but resistance is emerging. Malathion (0.5% formulation) is an alternative, but resistance to this agent has likewise emerged. Ivermectin is effective ...

Malathion is a neurotoxin and part of a dangerous class of old pesticides called organophosphates that have also been used as nerve agents in chemical warfare. In 2022 the Service finalized its ...