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  • Title: Effects of ultrasonic flea collars on Ctenocephalides felis on cats.
    Author: Dryden MW, Long GR, Gaafar SM.
    Journal: J Am Vet Med Assoc; 1989 Dec 15; 195(12):1717-8. PubMed ID: 2641212.
    Abstract:
    Ultrasonic flea collars marketed by 2 companies were evaluated for their ability to reduce flea numbers on cats with experimentally induced flea (Ctenocephalides felis) infestations. The sound output of the collars was evaluated both before and after use to ensure that the collars were functional. Each brand was evaluated on 5 cats for a 7-day period. Collars generated peak frequencies of 40 kHz and 80 to 92 dB sound pressure level at 10 cm. An average of 98.6 and 97.4% of the fleas were still on the cats after treatment and control periods, respectively. The ultrasonic flea collars were ineffective in reducing flea numbers on these cats.
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