Spinosad is a pediculicide mixture of spinosyn A and spinosyn D (in an approximately 5:1 ratio, respectively) used in the topical treatment of head lice in children (four years old and older) and in adults. Spinosad is an insecticide based on a compound found in S. spinosa, a bacterial species. Spinosad has also been experimented for use in cats for treatment of flea infestations, and has also been experimented for use against the KS1 Ctenocephalides felis flea strain infesting dogs, in addition to many investigations for use in other animals and agricultural plants.