From: Prophylactic treatment of flea-infested cats with an imidacloprid/flumethrin collar to forestall infection with Dipylidium caninum
Study day
Geometric mean number of fleas recovered
Efficacy (%)
Untreated control cats
Collared cats*
8
76.8
0.1
99.9
15
74.5
0
100
22
62.5
29
73.8