Discussion
This study demonstrated that the oral spinosad formulations
provided rapid initial speed of kill against the KS1
flea strain, with 100% efficacy within 24 hours of
treatment. However, the initial speed of kill of selamectin
was not as rapid; selamectin provided 60.4% and 91.4%
reductions in flea populations within 24 and 48 hours of
treatment, respectively.