Three groups of six cats were kept in similar carpeted pens in which a self-replicating population of Ctenocephalides felis had been established. One group was left untreated, but the other groups were treated every 28th day with 0.5 ml of a 10 per cent fipronil spot-on formulation, and the cats in one of the treated groups also wore a methoprene collar. No fleas were found on any of the treated cats, either during the first 13 weeks of the study, when heavy flea burdens were developing in the control pen, or over the next 11 weeks when a declining number of fleas was present on the control group.
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