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Cat Flea (Ctenocephalides Felis), Part 2: Prevention and Control

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Cat Flea (Ctenocephalides Felis), Part 2: Prevention and Control CLOSE ENCOUNTERS WITH THE ENVIRONMENT What’s Eating You? Cat Flea (Ctenocephalides felis), Part 2: Prevention and Control Dirk M. Elston, MD; Huy Do, BS he cat flea, Ctenocephalides felis, is a common host have the greatest ability to prevent reproduc- pest on both cats and dogs. It bites viciously, tion. For example, nitenpyram, an oral agent, has and because of its potential to spread disease, it demonstrated killing activity at 60 minutes post- T 2 has been the focus of extensive research on the utility treatment. A topical insecticide, metaflumizone, has of oral and topical insecticides. In addition to chemi- been shown to reduce egg production by 55.3% cal formulations, various mechanical and biological within 24 hours posttreatment at doses ranging from modalities have been developed to control flea popu- 39.0 to 76.2 mg/kg.1 lations. Pets should be treatedCUTIS by a knowledgeable In addition to insecticides that kill adult fleas, veterinarian. Environmental treatment often requires various systemic and topical ovicides and larvicides the help of an experienced exterminator. This review such as lufenuron, fipronil with methoprene, and will discuss the most practical approaches to control. pyriproxyfen are available to prevent cat fleas from reaching sexual maturity. Lufenuron must be ingested Prevention and Control of Cat Flea Infestation by larvae to be effective, while fipronil with metho- Oral and Topical Formulations of Insecticides—Various prene and pyriproxyfen require only skin contact. formulationsDo of insecticides haveNot been developed to AnotherCopy important point when treating com- control the flea population in pets (Table). In one panion animals using topical insecticides is the study, selamectin, imidacloprid, and fipronil demon- distribution of cat fleas. The greatest number of fleas strated similar efficacy against C felis felis and C felis can be found in the neck and head regions. Apply- strongylus.6 Different agents target specific stages of ing insecticide to these areas helps eliminate fleas flea development; therefore, it is important to under- more effectively.12 stand the life cycle of the flea. The eggs are sensitive Insecticide-resistant cat fleas pose a problem in to humidity and temperature and most will hatch in flea control, and models of resistance, such as the an environment with relative humidity above 50% KS1 strain, have been used to study insecticide and a temperature ranging from 168C to 278C.11 resistance. The reduced susceptibility of KS1 to After hatching, the larvae feed on feces from adult various insecticides, including imidacloprid and fleas. Fleas typically feed prior to mating and roughly fipronil, is associated with the mutation of the Rd1 24 hours elapse between the time of feeding and the gene.13 In a comparative study, metaflumizone was time of ovipositioning. Oral or topical formulations more effective in controlling the KS1 population that kill fleas within 24 hours of attachment to the than fipronil–(S)-methoprene; cats treated with metaflumizone (40 mg/kg) had more than 90% Dr. Elston is from the Departments of Dermatology and Laboratory flea reduction for 37 days compared to fipronil– Medicine, Geisinger Medical Center, Danville, Pennsylvania. (S)-methoprene (7.5 mg/kg), which only had 71.3% Mr. Do is from Philadelphia College of Osteopathic reduction for 30 days.13 A single dose of 11.4 mg Medicine, Pennsylvania. of nitenpyram also has been shown to be effec- The authors report no conflict of interest. 2 Correspondence: Dirk M. Elston, MD, Departments of Dermatology tive against KS1 fleas. Selamectin also provided and Laboratory Medicine, Geisinger Medical Center, 100 N Academy good results with more than 90% flea reduction Ave, Danville, PA 17822-5203 ([email protected]). for 28 days when it was used to eradicate the VOLUME 85, JUNE 2010 283 Copyright Cutis 2010. No part of this publication may be reproduced, stored, or transmitted without the prior written permission of the Publisher. Close Encounters With the Environment Different Formulations of Insecticides Time of Onset Susceptible Insecticide Mode of of Effects Duration of Stage of Formulation Drug Class Treatment on Fleas Effectivenessa Cat Flea Nitenpyram1,2 Neonicotinoid Oral 60 min Reduction of blood Adult flea consumption by 98.37%–99.89% up to 28 d posttreatment Metaflumizone3 Semicarbazone Topical 24–48 h .90% for up to 7 wk Adult flea Spinosyn A and Spinosad Oral Not reported 100% for 51 d Adult flea spinosyn D4 Fipronil–(S)- Phenylpyrazole/ Topical Not reported .95% for 5 wk in adult Larvae methoprene juvenile insect fleas; .90% for 8 wk in and adult combination5 hormone ovicide; .90% for 12 wk flea analogue for adult flea emergence Imidacloprid6,7 Neonicotinoid Topical 3 h 75.79% at 37 d Adult flea posttreatment Permethrin and Synthetic Topical Not reported 99.6% at 14 d; 97.7% Adult flea phenothrin8 pyrethroids CUTISpropylene at 28 d glycol monomethyl ether formulation Selamectin9 Avermectin Topical 12 h 100% within 48 h Eggs, larvae, posttreatment; effective and adult Do Not Copyup to 27 d flea Lufenuron10 Insect growth Oral Not reported Nonviable eggs for 11 d; Eggs, larvae, regulators/insect 98.2% for 32 d and adult development flea inhibitors aReduction in Ctenocephalides felis number or feeding. KS1 colony.14 Cottontail, KSU, and Auburn are M anisopliae group at a concentration of 5.313103 other colonies that have been shown to be resis- conidia/mL decreased the egg’s hatchability better tant to pyrethroids through a mechanism known than the B bassiana group at a concentration of as knockdown resistance. This mechanism involves 6.343108 conidia/mL. In adult fleas, B bassiana at a mutation of the para-type sodium channel protein, concentration of 7.393106 conidia/mL killed adult which makes the insect’s nervous system less sen- fleas more effectively than the M anisopliae group at sitive to the insecticide.15 Combining 2 or more a concentration of 1.943106 conidia/mL.16 classes of insecticides can reduce the emergence Other Control Methods—Regular grooming of resistance.4 reduces the number of fleas on pets. For hard sur- Entomopathogens—Another method being evalu- faces, dichlorvos and propetamphos demonstrate ated for control of C felis is the use of entomopatho- superior activity. For fabric and carpet, organo- gens.16 Beauveria bassiana and Metarhizium anisopliae phosphates are superior. Insect growth regula- are entomopathogenic fungi that appear promising. tors such as methoprene and fenoxycarb also play When measuring the effect against flea eggs, the a role. 284 CUTIS® Copyright Cutis 2010. No part of this publication may be reproduced, stored, or transmitted without the prior written permission of the Publisher. Close Encounters With the Environment Conclusion 7. Schenker R, Tinembart O, Humbert-Droz E, et al. Cat fleas not only have the potential to transmit Comparative speed of kill between nitenpyram, fipro- plague and other infectious diseases but also cost bil- nil, imidacloprid, selamectin and cythioate against adult lions of dollars to control. The abundance of this flea Ctenocephalides felis (Bouché) on cats and dogs. Vet on feral animals makes elimination of flea populations Parasitol. 2003;112:249-254. unlikely. Many oral and topical formulations are used 8. Endris RG, Hair JA, Anderson G, et al. Efficacy of two to control the population of C felis, and combinations 65% permethrin spot-on formulations against induced of agents have been suggested to avoid resistance. infestations of Ctenocephalides felis (Insecta: Siphonaptera) Entomopathogens and environmental treatments also and Amblyomma americanum (Acari: Ixodidae) on beagles. produce good results. Continued research is needed to Vet Ther. 2003;4:47-55. find novel methods to prevent vector-borne diseases. 9. McTier TL, Jones RL, Holbert MS, et al. Efficacy of A knowledgeable veterinarian is the best source of selamectin against adult flea infestations (Ctenocephalides current information. felis felis and Ctenocephalides canis) on dogs and cats. Vet Parasitol. 2000;91:187-199. REFERENCES 10. Blagburn BL, Vaughan JL, Lindsay DS, et al. Efficacy dos- 1. Dryden M, Payne P, Lowe A, et al. Efficacy of a age titration of lufenuron against developmental stages topically applied formulation of metaflumizone on cats of fleas (Ctenocephalides felis felis) in cats. Am J Vet Res. against the adult cat flea, flea egg production and 1994;55:98-101. hatch, and adult flea emergence. Vet Parasitol. 2007;150: 11. Silverman J, Rust MK, Reierson DA. Influence of tem- 263-267. perature and humidity on survival and development of the 2. McCoy C, Broce AB, Dryden MW. Flea blood feeding cat flea, Ctenocephalides felis (Siphonaptera: Pulicidae). J patterns in cats treated with oral nitenpyram and the topi- Med Entomol. 1981;18:78-83. cal insecticides imidacloprid, fipronil and selamectin. Vet 12. Hsu MH, Hsu TC, Wu WJ. Distribution of cat fleas Parasitol. 2008;156:293-301. (Siphonaptera: Pulicidae) on the cat. J Med Entomol. 3. Holzmer S, Hair JA, Dryden MW, et al. Efficacy of a 2002;39:685-688. novel formulation of metaflumizoneCUTIS for the control of 13. Dryden M, Payne P, Lowe A, et al. Efficacy of a topically fleas (Ctenocephalides felis) on cats. Vet Parasitol. 2007;150: applied spot-on formulation of a novel insecticide, meta- 219-224. flumizone, applied to cats against a flea strain (KS1) with 4. Snyder DE, Meyer J, Zimmermann AG, et al. Preliminary documented reduced susceptibility to various insecticides. studies on the effectiveness of the novel pulicide, spi- Vet Parasitol. 2008;151:74-79. nosad, for the treatment and control of fleas on dogs. Vet 14. Dryden MW, Smith V, Payne PA, et al. Comparative Parasitol. 2007;150:345-351. speed of kill of selamectin, imidacloprid, and fipronil- 5. DoYoung DR, Jeannin PC, Boeckh Not A. Efficacy of fipronil/ (S)-methopreneCopy spot-on formulations against fleas on cats. (S)-methoprene combination spot-on for dogs against Vet Ther.
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