1
|
Fisara P, Guerino F, Sun F. Efficacy of a spot-on combination of fluralaner plus moxidectin (Bravecto ® Plus) in cats following repeated experimental challenge with a field isolate of Ctenocephalides felis. Parasit Vectors 2019; 12:259. [PMID: 31122282 PMCID: PMC6533700 DOI: 10.1186/s13071-019-3512-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 05/17/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A spot-on formulation of fluralaner plus moxidectin has been designed to provide long-term protection against fleas and ticks, prevent heartworm disease and treat gastrointestinal nematode infections in cats. The objective of this study was to determine the efficacy of this product against fleas collected from a household with repeated fipronil failures following owner-administered treatments. METHODS Thirty cats were randomized to three equal groups: (A) untreated controls; (B) to receive a single application of fluralaner plus moxidectin (Bravecto® Plus) at 40 mg/kg and 2 mg/kg body weight, respectively; and (C) three applications at one month intervals with a spot-on formulation of fipronil and (S)-methoprene (Frontline® Plus) at 0.5 ml manufacturer recommended dose. Flea challenges were completed on Days -6 (for randomization), -1, 7, 14, 28, 42, 56, 70, 77, 84 and 91. Flea counts were completed 48 hours after initial treatment and 48 hours following each subsequent challenge. RESULTS Fleas were found on all control and all fipronil and (S)-methoprene treated cats at every assessment. From Day 2 to Day 93, all cats in the fluralaner plus moxidectin group were flea-free, with one exception (Day 58; three fleas counted on one cat); control group flea counts ranged between 34-109, and fipronil and (S)-methoprene group counts ranged between 1-79. At each assessment after Day 0, compared to the control group, geometric mean flea counts were significantly lower in the fipronil and (S)-methoprene group (P ≤ 0.04) and in the fluralaner plus moxidectin group (P < 0.001), and mean flea counts in the fluralaner plus moxidectin group were significantly lower than those of the fipronil and (S)-methoprene group (P < 0.001). The efficacy of fluralaner plus moxidectin, based on geometric means, was 100% at each assessment post-Day 0 except on Day 58 when efficacy was 99.7%. In the fipronil and (S)-methoprene group efficacy ranged between 30.6-65.6%. CONCLUSIONS These findings demonstrate complete efficacy of fluralaner plus moxidectin against a flea isolate that was not controlled by fipronil and (S)-methoprene. This study provides confirmation of the consistent, sustained efficacy of topically applied fluralaner in the treatment and control of flea infestations in cats.
Collapse
Affiliation(s)
- Petr Fisara
- MSD Animal Health Australia Ltd., 26 Artisan Road, Seven Hills, NSW 2147 Australia
| | - Frank Guerino
- Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| | - Fangshi Sun
- Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| |
Collapse
|
2
|
Coura-Vital W, Leal GGDA, Marques LA, Pinheiro ADC, Carneiro M, Reis AB. Effectiveness of deltamethrin-impregnated dog collars on the incidence of canine infection by Leishmania infantum: A large scale intervention study in an endemic area in Brazil. PLoS One 2018; 13:e0208613. [PMID: 30532255 PMCID: PMC6287856 DOI: 10.1371/journal.pone.0208613] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 11/20/2018] [Indexed: 11/18/2022] Open
Abstract
To reduce morbidity and mortality caused by visceral leishmaniasis (VL), the Brazilian Visceral Leishmaniasis Control and Surveillance Program promotes the diagnosis and treatment of cases, vector control, euthanasia of seropositive dogs, and health education. Nevertheless, the effectiveness of these measures is questionable as they lead to little reduction in the transmission of the disease. Thus, the effectiveness of strategies such as insecticide-impregnated collars, spot-on insecticides, and immunization of dogs should be assessed. Herein, we evaluated the effectiveness of deltamethrin-impregnated collars on reducing the incidence of Leishmania infantum infection in dogs living in an endemic area of VL. An intervention study was conducted and a total 5,850 dogs were analyzed in baseline. Of these 3,742 seronegative dogs were divided into two groups: collared and uncollared (control). Dogs were followed for 12 months and three interventions were performed. The Cox regression model was used to evaluate the effectiveness of the collar. All analyzes were performed by Intention-to-treat and per-protocol. By intention-to-treat, the incidence rates of L. infantum infection were 7.5 and 7.9 in the collar group, and 6.5 and 13.2 per 1,000 dogs-months in the control group after 6 and 12 months, respectively. In the per-protocol analysis, the incidence rates in the control group were similar to those observed in the intention-to-treat analysis. In the collar group, the incidence rate was 5.1/1,000 dogs-months after 6 and 12 months. The effectiveness by intention-to-treat after adjustment by the multivariate Cox model was 48%. In the analysis per-protocol, the effectiveness increased to 63%. Although collar use was effective when it was evaluated by intention-to-treat, higher effectiveness was found in the per-protocol analysis after one year of follow-up. The data emphasize the importance of the uninterrupted use of deltamethrin-impregnated collars to increase protection against canine VL.
Collapse
Affiliation(s)
- Wendel Coura-Vital
- Programa de Pós-Graduação em Ciências Farmacêuticas, Departamento de Análises Clínicas, Escola de Farmácia, Universidade Federal de Ouro Preto, Minas Gerais, Brazil
- Laboratório de Imunopatologia, Programa de Pós-Graduação em Ciências Biológicas, Núcleo de Pesquisa em Ciências Biológicas, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
- * E-mail:
| | - Gleisiane Gomes de Almeida Leal
- Laboratório de Imunopatologia, Programa de Pós-Graduação em Ciências Biológicas, Núcleo de Pesquisa em Ciências Biológicas, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Luana Araújo Marques
- Centro de Controle de Zoonoses, Secretaria Municipal de Saúde, Governador Valadares, Minas Gerais, Brazil
| | - Aimara da Costa Pinheiro
- Centro de Controle de Zoonoses, Secretaria Municipal de Saúde, Governador Valadares, Minas Gerais, Brazil
| | - Mariângela Carneiro
- Laboratório de Epidemiologia das Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Alexandre Barbosa Reis
- Laboratório de Imunopatologia, Programa de Pós-Graduação em Ciências Biológicas, Núcleo de Pesquisa em Ciências Biológicas, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil
- Instituto Nacional de Ciência e Tecnologia em Doenças Tropicais—INCT-DT, Salvador, Bahia, Brazil
| |
Collapse
|
3
|
Rohdich N, Zschiesche E, Wolf O, Loehlein W, Kirkova Z, Iliev P, Rapti D, Postoli R, Capári B, Farkas R, Roepke RKA. A randomized, blinded, controlled, multi-centered field study assessing the treatment of gastrointestinal nematode infections in cats with fluralaner plus moxidectin spot-on solution (Bravecto® Plus). Parasit Vectors 2018; 11:589. [PMID: 30449275 PMCID: PMC6240952 DOI: 10.1186/s13071-018-3169-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 10/25/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A spot-on formulation containing fluralaner (280 mg/ml) plus moxidectin (14 mg/ml) (Bravecto® Plus) was developed for the treatment of nematode infections as well as providing 12 weeks of protection against insect and acarine parasites in cats. The effectiveness and safety of this product against feline gastrointestinal nematodes was assessed in naturally-infested, client-owned cats under field conditions in Albania, Bulgaria, Germany and Hungary. METHODS To be eligible for enrollment in this investigator-blinded study cats had to be at least 10 weeks-old, weigh at least 1.2 kg, be clinically healthy, and have a faecal sample testing positive for nematodes no more than eight days prior to treatment. Cats were stratified into blocks of three in order of presentation at each center and randomly allocated in a 2:1 ratio to be treated topically on Day 0 with fluralaner plus moxidectin (minimum dose rates 40 mg/kg and 2 mg/kg, respectively) or emodepside plus praziquantel (minimum dose rates 3 mg/kg and 12 mg/kg, respectively) (Profender®). Faecal samples were collected from cats prior to treatment and 14 ± 4 days later. RESULTS There were 182 cats randomized to the fluralaner plus moxidectin group, and 91 to the emodepside plus praziquantel group. Prior to treatment the most commonly identified nematode egg was Toxocara cati, found in 79.1 and 82.4% of cats in the fluralaner plus moxidectin and emodepside plus praziquantel groups, respectively. Eggs of Toxascaris leonina were found in 8.2 and 6.6% of cats; of hookworms in 30.8 and 24.2%; and of Capillaria spp. in 7.1 and 4.3%, respectively. After treatment, faecal samples from 98.3% of fluralaner plus moxidectin treated and 96.6% of emodepside plus praziquantel-treated cats were free of nematode ova. Geometric mean faecal egg count reductions for T. cati, the only eggs found in post-treatment faecal samples, were 99.97% and 99.93%, respectively. Treatment with fluralaner plus moxidectin was non-inferior to emodepside plus praziquantel. Both products were safe and well tolerated by cats treated under field conditions. CONCLUSIONS This field study confirms that, in addition to 12-week extended duration flea and tick control, fluralaner plus moxidectin provides broad spectrum treatment of nematodes in cats.
Collapse
Affiliation(s)
- Nadja Rohdich
- MSD Animal Health Innovation GmbH, Zur Propstei, 55270 Schwabenheim, Germany
| | - Eva Zschiesche
- MSD Animal Health Innovation GmbH, Zur Propstei, 55270 Schwabenheim, Germany
| | - Oliver Wolf
- Loehlein & Wolf Vet Research, Maistrasse 69, 80337 Munich, Germany
| | | | - Zvezdelina Kirkova
- Department of Parasitology, Trakia University, Faculty of Veterinary Medicine, Student Campus, 6000 Stara Zagora, Bulgaria
| | - Petar Iliev
- Department of Parasitology, Trakia University, Faculty of Veterinary Medicine, Student Campus, 6000 Stara Zagora, Bulgaria
| | - Dhimitër Rapti
- Klinika Veterinare Xhimi, Bulevardi Bajram Curri Nr 2, Tirana, Albania
| | - Rezart Postoli
- Faculty of Veterinary Medicine, Agricultural University, Kodër Kamëz, Tirana, Albania
| | | | - Róbert Farkas
- Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, István u. 2, 1078 Budapest VII, Hungary
| | - Rainer K. A. Roepke
- MSD Animal Health Innovation GmbH, Zur Propstei, 55270 Schwabenheim, Germany
| |
Collapse
|
4
|
Eads DA, Biggins DE, Bowser J, McAllister JC, Griebel RL, Childers E, Livieri TM, Painter C, Krank LS, Bly K. RESISTANCE TO DELTAMETHRIN IN PRAIRIE DOG ( CYNOMYS LUDOVICIANUS) FLEAS IN THE FIELD AND IN THE LABORATORY. J Wildl Dis 2018; 54:745-754. [PMID: 29723100 PMCID: PMC6710209 DOI: 10.7589/2017-10-250] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Sylvatic plague poses a substantial risk to black-tailed prairie dogs ( Cynomys ludovicianus) and their obligate predator, the black-footed ferret ( Mustela nigripes). The effects of plague on prairie dogs and ferrets are mitigated using a deltamethrin pulicide dust that reduces the spread of plague by killing fleas, the vector for the plague bacterium. In portions of Conata Basin, Buffalo Gap National Grassland, and Badlands National Park, South Dakota, US, 0.05% deltamethrin has been infused into prairie dog burrows on an annual basis since 2005. We aimed to determine if fleas ( Oropsylla hirsuta) in portions of the Conata Basin and Badlands National Park have evolved resistance to deltamethrin. We assessed flea prevalence, obtained by combing prairie dogs for fleas, as an indirect measure of resistance. Dusting was ineffective in two colonies treated with deltamethrin for >8 yr; flea prevalence rebounded within 1 mo of dusting. We used a bioassay that exposed fleas to deltamethrin to directly evaluate resistance. Fleas from colonies with >8 yr of exposure to deltamethrin exhibited survival rates that were 15% to 83% higher than fleas from sites that had never been dusted. All fleas were paralyzed or dead after 55 min. After removal from deltamethrin, 30% of fleas from the dusted colonies recovered, compared with 1% of fleas from the not-dusted sites. Thus, deltamethrin paralyzed fleas from colonies with long-term exposure to deltamethrin, but a substantial number of those fleas was resistant and recovered. Flea collections from live-trapped prairie dogs in Thunder Basin National Grassland, Wyoming, US, suggest that, in some cases, fleas might begin to develop a moderate level of resistance to deltamethrin after 5-6 yr of annual treatments. Restoration of black-footed ferrets and prairie dogs will rely on an adaptive, integrative approach to plague management, for instance involving the use of vaccines and rotating applications of insecticidal products with different active ingredients.
Collapse
Affiliation(s)
- David A. Eads
- Department of Biology, Colorado State University, Campus Delivery 1878, Fort Collins, Colorado 80523, USA
- Corresponding author ()
| | - Dean E. Biggins
- US Geological Survey, Fort Collins Science Center, 2150 Centre Avenue Building C, Fort Collins, Colorado 80526, USA
| | - Jonathan Bowser
- US Geological Survey, Fort Collins Science Center, 2150 Centre Avenue Building C, Fort Collins, Colorado 80526, USA
| | - Janet C. McAllister
- Centers for Disease Control and Prevention, Fort Collins, Colorado 80521, USA
| | - Randall L. Griebel
- US Forest Service, Wall Ranger District, 710 Main Street, Wall, South Dakota 57790, USA
| | - Eddie Childers
- National Park Service, Badlands National Park, 25216 Ben Reifel Road, Interior, South Dakota 57750, USA
| | - Travis M. Livieri
- Prairie Wildlife Research, PO Box 308, Wellington, Colorado 80549, USA
| | - Cristi Painter
- US Forest Service, Thunder Basin National Grassland, 2250 E Richards Street, Douglas, Wyoming 82633, USA
| | - Lindsey Sterling Krank
- The Humane Society of the United States, Prairie Dog Coalition, 2525 Arapahoe #E4-527, Boulder, Colorado 80302, USA
| | - Kristy Bly
- World Wildlife Fund, Northern Great Plains Program, 458 Saddle Ridge Road, Hamilton, Montana 59840, USA
| |
Collapse
|
5
|
Poché DM, Torres-Poché Z, Yeszhanov A, Poché RM, Belyaev A, Dvořák V, Sayakova Z, Polyakova L, Aimakhanov B. Field evaluation of a 0.005% fipronil bait, orally administered to Rhombomys opimus, for control of fleas (Siphonaptera: Pulicidae) and phlebotomine sand flies (Diptera: Psychodidae) in the Central Asian Republic of Kazakhstan. PLoS Negl Trop Dis 2018; 12:e0006630. [PMID: 30044788 PMCID: PMC6059381 DOI: 10.1371/journal.pntd.0006630] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 06/22/2018] [Indexed: 01/14/2023] Open
Abstract
Plague (Yersinia pestis) and zoonotic cutaneous leishmaniasis (Leishmania major) are two rodent-associated diseases which are vectored by fleas and phlebotomine sand flies, respectively. In Central Asia, the great gerbil (Rhombomys opimus) serves as the primary reservoir for both diseases in most natural foci. The systemic insecticide fipronil has been previously shown to be highly effective in controlling fleas and sand flies. However, the impact of a fipronil-based rodent bait, on flea and sand fly abundance, has never been reported in Central Asia. A field trial was conducted in southeastern Kazakhstan to evaluate the efficacy of a 0.005% fipronil bait, applied to gerbil burrows for oral uptake, in reducing Xenopsylla spp. flea and Phlebotomus spp. sand fly abundance. All active gerbil burrows within the treated area were presented with ~120 g of 0.005% fipronil grain bait twice during late spring/early summer (June 16, June 21). In total, 120 occupied and 14 visited gerbil colonies were surveyed and treated, and the resulting application rate was minimal (~0.006 mg fipronil/m2). The bait resulted in 100% reduction in Xenopsylla spp. flea abundance at 80-days post-treatment. Gravid sand flies were reduced ~72% and 100% during treatment and at week-3 post-treatment, respectively. However, noticeable sand fly reduction did not occur after week-3 and results suggest environmental factors also influenced abundance significantly. In conclusion, fipronil bait, applied in southeastern Kazakhstan, has the potential to reduce or potentially eliminate Xenopsylla spp. fleas if applied at least every 80-days, but may need to be applied at higher frequency to significantly reduce the oviposition rate of Phlebotomus spp. sand flies. Fipronil-based bait may provide a means of controlling blood-feeding vectors, subsequently reducing disease risk, in Central Asia and other affected regions globally.
Collapse
Affiliation(s)
- David M. Poché
- Genesis Laboratories, Inc. Wellington, Colorado, United States of America
| | - Zaria Torres-Poché
- Genesis Laboratories, Inc. Wellington, Colorado, United States of America
| | - Aidyn Yeszhanov
- M. Aikimbaev’s Kazakh Science Centre for Quarantine of Zoonotic Diseases. Almaty, Kazakhstan
| | - Richard M. Poché
- Genesis Laboratories, Inc. Wellington, Colorado, United States of America
| | - Alexander Belyaev
- M. Aikimbaev’s Kazakh Science Centre for Quarantine of Zoonotic Diseases. Almaty, Kazakhstan
| | - Vit Dvořák
- Department of Parasitology, Charles University, Prague, Czech Republic
| | - Zaure Sayakova
- M. Aikimbaev’s Kazakh Science Centre for Quarantine of Zoonotic Diseases. Almaty, Kazakhstan
| | - Larisa Polyakova
- Genesis Laboratories, Inc. Wellington, Colorado, United States of America
| | - Batirbek Aimakhanov
- M. Aikimbaev’s Kazakh Science Centre for Quarantine of Zoonotic Diseases. Almaty, Kazakhstan
| |
Collapse
|
6
|
Ghavami MB, Haghi FP, Alibabaei Z, Enayati AA, Vatandoost H. First report of target site insensitivity to pyrethroids in human flea, Pulex irritans (Siphonaptera: Pulicidae). Pestic Biochem Physiol 2018; 146:97-105. [PMID: 29626998 DOI: 10.1016/j.pestbp.2018.03.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/11/2018] [Indexed: 06/08/2023]
Abstract
The human flea, Pulex irritans, is the most important ectoparasite of humans. Intensive use of pyrethroids for its control has led to insecticide resistance. Monitoring pyrethroid resistance and its underlying mechanisms is essential for flea control. The aims of this study were to identify the susceptibility status of human flea to permethrin and to detect the presence of knockdown resistance (kdr) mutation and its frequency in populations of P. irritans. Adults of P. irritans were collected from Zanjan Province, northwest of Iran, during 2013-2017. Different populations of this flea were exposed to permethrin 0.75% for one and 8 h and then the mortality rate, as well as KD50 and KD95 times were calculated. Total RNA and gDNA of samples were extracted, and the fragments of cDNA encoding the partial voltage-gated sodium channel (VGSC) peptides were amplified using degenerated primers. Specific PCR and TaqMan real-time assays were conducted to characterize the vgsc gene and to detect the presence of mutation and genotyping of the populations. Mortality rates were in the range from 32% to 67% for one-hour and 73% to 90% for eight-hour exposure to permethrin 0.75%. KD50 and KD95 times varied in a range from 46 to 241 and 177 to 899 min, respectively. Sequencing of 70 amplified fragments of gDNA resulted in a 578-bp product. These fragments contained two introns (92 and 63 bp) and three exons (141, 189, and 92 bp) encoding 138 amino acids that encompassed IIS4-IIS6 and the partial linker between domains II and III of VGSC. All the studied populations showed L1014F mutation, substitution of CTT for TTT at the 1014 allele. The result of TaqMan assay for 624 samples showed 96.6% homogenous and 3.36% heterozygous mutant. The development of permethrin resistance and the presence of the L1014F mutation at high frequency in flea populations indicate that pyrethroids are likely ineffective in controlling human flea. Therefore, novel alternative control methods are needed to combat this human ectoparasite.
Collapse
Affiliation(s)
- Mohammad Bagher Ghavami
- Department of Medical Entomology and Vector Control, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran.
| | - Fahimeh Pourrastgou Haghi
- Department of Medical Entomology and Vector Control, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Zohreh Alibabaei
- Department of Medical Entomology and Vector Control, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Ahmad Ali Enayati
- School of Public Health and Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
| | - Hassan Vatandoost
- Department of Medical Entomology and Vector Control, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
| |
Collapse
|
7
|
Affiliation(s)
- Susan E Little
- Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, 74074, USA.
| |
Collapse
|
8
|
Crosaz O, Bonati S, Briand A, Chapelle E, Cochet-Faivre N, Ka D, Darmon-Hadjaje C, Varloud M, Guillot J. Usefulness of a topical combination of dinotefuran and pyriproxyfen for long-term control of clinical signs of allergic dermatitis in privately-owned cats in Ile-de-France region. Parasit Vectors 2017; 10:392. [PMID: 28830567 PMCID: PMC5567644 DOI: 10.1186/s13071-017-2335-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 08/15/2017] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The present study assessed the activity of a combination of dinotefuran and pyriproxyfen (Vectra® Felis) for long-term control (3 months) of allergic dermatitis (AD) in privately-owned cats under common household conditions in Ile-de-France region. METHODS This was an open pre-treatment vs post-treatment study. Twenty-eight client-owned cats with clinical signs of AD were enrolled in the study. They received topical application of the combination of dinotefuran and pyriproxyfen on days 0, 28, 56 and 84. Two parameters (clinical signs and pruritus severity) were used to assess the animals' condition on days 0, 28 and 84. Fleas were counted if they were observed. RESULTS Of the 28 cats initially enrolled, 26 were presented on day 28 and 20 for the final evaluation on day 84. A significant improvement in clinical signs and pruritus was observed in cats for which fleas and/or flea feces were detected on day 0. Globally, the post-treatment AD clinical scores on days 28 and 84 were different from that of the pre-treatment on day 0, with a reduction of 30% and 71%, respectively. For cats with fleas and/or flea feces, the reduction on days 28 and 84 was 33% and 85%, respectively. The improvement of clinical signs and pruritus was not significant in cats with no visible fleas and no flea feces at the beginning of the trial (n = 8). CONCLUSIONS The present study indicated that the treatment with a combination of dinotefuran and pyriproxyfen should be considered as useful in controlling fleas on cats without additional environmental treatment and useful for long-term control of clinical signs and pruritus in allergic cats.
Collapse
Affiliation(s)
- Odile Crosaz
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Silvia Bonati
- Ceva Santé Animale, 10 avenue de la Ballastière, 33500, Libourne, France
| | - Amaury Briand
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Elodie Chapelle
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Noëlle Cochet-Faivre
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Diane Ka
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Céline Darmon-Hadjaje
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| | - Marie Varloud
- Ceva Santé Animale, 10 avenue de la Ballastière, 33500, Libourne, France
| | - Jacques Guillot
- Department of Parasitology, Mycology and Dermatology, CHUVA, École nationale vétérinaire d’Alfort, UPE, 7 avenue du Général de Gaulle, 94704, Maisons-Alfort, France
| |
Collapse
|
9
|
Dryden MW, Canfield MS, Niedfeldt E, Kinnon A, Kalosy K, Smith A, Foley KM, Smith V, Bress TS, Smith N, Endrizzi M, Login J. Evaluation of sarolaner and spinosad oral treatments to eliminate fleas, reduce dermatologic lesions and minimize pruritus in naturally infested dogs in west Central Florida, USA. Parasit Vectors 2017; 10:389. [PMID: 28814316 PMCID: PMC5559866 DOI: 10.1186/s13071-017-2328-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 08/09/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND An in-home investigation of naturally flea infested dogs was conducted in West Central Florida, USA to evaluate and compare the effectiveness of two different oral flea adulticides to control flea infestations, minimize dermatologic lesions and reduce pruritus over an 8-week period. METHODS Twenty-nine dogs living in 19 homes and another 26 dogs residing in 16 different homes were orally administered either a sarolaner or spinosad chewable, respectively on day 0 and once between days 28-30. Products were administered by study personnel according to label directions. Flea populations on dogs were estimated using visual area counts and flea infestations in the indoor premises were assessed using intermittent-light flea traps on days 0, 7, 14, 21 and once between days 28-30, 40-45, and 56-60. Assessments of dermatologic lesions were conducted monthly during the study and severity of pruritus was evaluated throughout the study on the same schedule as flea counts were conducted. Concurrent treatments for existing skin disease were not allowed. RESULTS The administration of sarolaner or spinosad reduced flea populations on dogs by 99.0% and 97.3%, respectively within 7 days. Flea infestations on the sarolaner- and spinosad-treated dogs were reduced by > 99% at every counting period from day 14 post-treatment through the end of the 8-week study. At the end of the study 96.4 and 92.0% of the dogs treated with sarolaner and spinosad, respectively were flea-free. Flea populations in the indoor premises were also markedly reduced the end of the study, with 100 and 99.8% reductions in flea trap counts in the sarolaner and spinosad treatment groups, respectively. FAD lesion scores, atopic dermatitis lesions scores (CADESI-4) and pruritus severity scores were also markedly improved with both formulations. CONCLUSIONS An in-home clinical field study conducted during the summer of 2016 in subtropical Florida demonstrated that two-monthly administrations of either sarolaner or spinosad chewables almost completely eliminated flea infestations on dogs and in private residences, while markedly reducing dermatology lesions and pruritus.
Collapse
Affiliation(s)
- Michael W. Dryden
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | | | - Emily Niedfeldt
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Amanda Kinnon
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Kimberly Kalosy
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Amber Smith
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Kaitlin M. Foley
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Vicki Smith
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Todd S Bress
- Animal Dermatology South, 7741 Congress Str, New Port Richey, FL 34653 USA
| | - Nicole Smith
- Animal Dermatology South, 7741 Congress Str, New Port Richey, FL 34653 USA
| | - Mike Endrizzi
- Zoetis US LLC, 100 Campus Drive, W4668, Florham Park, NJ 07932 USA
| | - Joyce Login
- GBBM Consulting, 16036 Eagle River Way, Tampa, FL 33624 USA
| |
Collapse
|
10
|
Dryden MW, Canfield MS, Kalosy K, Smith A, Crevoiserat L, McGrady JC, Foley KM, Green K, Tebaldi C, Smith V, Bennett T, Heaney K, Math L, Royal C, Sun F. Evaluation of fluralaner and afoxolaner treatments to control flea populations, reduce pruritus and minimize dermatologic lesions in naturally infested dogs in private residences in west central Florida USA. Parasit Vectors 2016; 9:365. [PMID: 27352607 PMCID: PMC4924230 DOI: 10.1186/s13071-016-1654-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/16/2016] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND A study was conducted to evaluate and compare the effectiveness of two different oral flea and tick products to control flea infestations, reduce pruritus and minimize dermatologic lesions over a 12 week period on naturally infested dogs in west central FL USA. METHODS Thirty-four dogs with natural flea infestations living in 17 homes were treated once with a fluralaner chew on study day 0. Another 27 dogs living in 17 different homes were treated orally with an afoxolaner chewable on day 0, once between days 28-30 and once again between days 54-60. All products were administered according to label directions by study investigators. Flea populations on pets were assessed using visual area counts and premise flea infestations were assessed using intermittent-light flea traps on days 0, 7, 14, 21, and once between days 28-30, 40-45, 54-60 and 82-86. Dermatologic assessments were conducted on day 0 and once monthly. Pruritus assessments were conducted by owners throughout the study. No concurrent treatments for existing skin disease (antibiotics, anti-inflammatories, anti-fungals) were allowed. RESULTS Following the first administration of fluralaner or afoxolaner, flea populations on pets were reduced by 99.0 % and 99.3 %, respectively within 7 days. Flea populations on the fluralaner treated dogs were 0 (100 % efficacy) on days 54-60 and 82-86 after the administration of a single dose on day 0. Administration of 3 monthly doses of afoxolaner reduced flea populations by 100 % on days 82-86. Flea numbers in indoor-premises were markedly reduced in both treatment groups by days 82-86, with 100 % and 98.9 % reductions in flea trap counts in the fluralaner and afoxolaner treatment groups, respectively. Marked improvement was observed in FAD lesion scoring, Atopic Dermatitis lesions scoring (CADESI-4) and pruritus scores with both formulations. CONCLUSIONS In a clinical field investigation conducted during the summer of 2015 in subtropical Florida, a single administration of an oral fluralaner chew completely eliminated dog and premises flea infestations and markedly reduced dermatology lesions and pruritus. Three monthly doses of the afoxolaner chewable also eliminated flea infestations in dogs, markedly reduced premises' flea populations and similarly improved dermatology lesions and pruritus.
Collapse
Affiliation(s)
- Michael W. Dryden
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | | | - Kimberly Kalosy
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Amber Smith
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Lisa Crevoiserat
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Jennifer C. McGrady
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Kaitlin M. Foley
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Kathryn Green
- />Animal Dermatology South, 7741 Congress St, New Port Richey, FL 34653 USA
| | - Chantelle Tebaldi
- />Animal Dermatology South, 7741 Congress St, New Port Richey, FL 34653 USA
| | - Vicki Smith
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Tashina Bennett
- />Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506 USA
| | - Kathleen Heaney
- />Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| | - Lisa Math
- />Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| | - Christine Royal
- />Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| | - Fangshi Sun
- />Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940 USA
| |
Collapse
|
11
|
Rust MK, Lance W, Hemsarth H. Synergism of the IGRs Methoprene and Pyriproxyfen Against Larval Cat Fleas (Siphonaptera: Pulicidae). J Med Entomol 2016; 53:629-633. [PMID: 26957391 DOI: 10.1093/jme/tjw010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 02/08/2016] [Indexed: 06/05/2023]
Abstract
Insect growth regulators (IGRs) methoprene and pyriproxyfen are widely used as topical treatments to pets or applied to the indoor environment to control cat fleas, Ctenocephalides felis (Bouché). The toxicity of methoprene, pyriproxyfen, and combinations of both IGRs to cat flea larvae was determined. The LC50 of methoprene and pyriproxyfen applied to larval rearing medium was 0.39 and 0.19 ppm, respectively. Combinations of methoprene:pyriproxyfen in ratios of 1:1, 5:1, 10:1, and 20:1 produced LC50s of 0.06, 0.09, 0.19, and 0.13 ppm, respectively. The pyriproxyfen synergized the activity of methoprene as indicated by the combination indices (CI). The ratio of methoprene:pyriproxyfen (40:1) provided an LC50 of 0.42 ppm and the pyriproxyfen was not synergistic. Combinations of pyriproxyfen:methoprene in ratios of 5:1, 10:1, and 20:1 provided LC50s of 0.14, 0.20, 0.20 ppm, respectively, and the methoprene did not synergize the activity of pyriproxyfen. The dose-reduction indices (DRIs) indicated that the concentrations of IGRs in the combinations of methoprene:pyriproxyfen (ratios of 20:1 or less) could be reduced by at least one-third of the amount required by methoprene alone to provide similar larval mortality. Combinations of methoprene and pyriproxyfen may be effective in increasing the residual activity on pets and assist in reducing the likelihood of insecticide resistance developing to IGRs.
Collapse
Affiliation(s)
- Michael K Rust
- Department of Entomology, University of California, Riverside, Riverside, CA 92521-0314 ,
| | | | - H Hemsarth
- The Hartz Mountain Corp., Secaucus, NJ 07094
| |
Collapse
|
12
|
Beugnet F, Porphyre T, Sabatier P, Chalvet-Monfray K. Use of a mathematical model to study the dynamics ofCtenocephalides felispopulations in the home environment and the impact of various control measures. Parasite 2014; 11:387-99. [PMID: 15638140 DOI: 10.1051/parasite/2004114387] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The biology of fleas has been studied by a number of authors, as has the impact of various types of control measures. However, there are no mathematical models simulating the dynamics of a population of Ctenocephalides felis felis fleas on their host (the cat) and in their close environment (apartment). The model presented in this paper allows for integration of the numerous biological and behavioural parameters of the parasites and their hosts and for the variation of these same parameters. The various types of control measures can be programmed so that their impact over time can be studied. The model confirms the key role played by adult fleas, or emerged fleas contained in the cocoon. Only regular applications of persistent insecticides to the host animal will enable control of the parasite population. A combination of these insecticides with an IGR (Insect Growth Regulator) will accelerate decontamination of the home environment and see the disappearance of the parasites altogether if they are not reintroduced. The association of additional measures such as vacuum cleaning will accelerate the process of decontamination but will have no impact if carried out in isolation. One-off treatment with insecticide will not enable a reduction in the parasite population, even if carried out frequently. Use of insecticides on the home environment premises alone does not appear to be an adequate means of control. The present model can be used to test various integrated control measures which take into account different factors such as the number of host animals, the frequency of movement outdoors, the impact of the seasons.
Collapse
Affiliation(s)
- F Beugnet
- Merial, 29, avenue Tony Garnier, 69007 Lyon, France.
| | | | | | | |
Collapse
|
13
|
Fisara P, Sargent RM, Shipstone M, von Berky A, von Berky J. An open, self-controlled study on the efficacy of topical indoxacarb for eliminating fleas and clinical signs of flea-allergy dermatitis in client-owned dogs in Queensland, Australia. Vet Dermatol 2014; 25:195-e49. [PMID: 24797425 PMCID: PMC4258095 DOI: 10.1111/vde.12132] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/01/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Canine flea-allergy dermatitis (FAD), a hypersensitivity response to antigenic material in the saliva of feeding fleas, occurs worldwide and remains a common presentation in companion animal veterinary practice despite widespread availability of effective systemic and topical flea-control products. HYPOTHESIS/OBJECTIVES To evaluate the clinical response in dogs with FAD treated topically with indoxacarb, a novel oxadiazine insecticide. ANIMALS Twenty-five client-owned dogs in Queensland, Australia diagnosed with pre-existing FAD on the basis of clinical signs, flea-antigen intradermal and serological tests. METHODS An open-label, noncontrolled study, in which all dogs were treated with topical indoxacarb at 4 week intervals, three times over 12 weeks. RESULTS Twenty-four dogs completed the study. Complete resolution of clinical signs of FAD was observed in 21 cases (87.5%), with nearly complete resolution or marked improvement in the remaining three cases. Mean clinical scores (Canine Atopic Dermatitis Extent and Severity Index-03) were reduced by 93.3% at week 12. Mean owner-assessed pruritus scores were reduced by 88% by week 12. Mean flea counts reduced by 98.7 and 100% in weeks 8 and 12, respectively. CONCLUSIONS AND CLINICAL IMPORTANCE Topical indoxacarb treatment applied every 4 weeks for 12 weeks, without concomitant antipruritic or ectoparasiticide therapy, completely alleviated flea infestations in all dogs and associated clinical signs of FAD in a high proportion of this population of dogs in a challenging flea-infestation environment.
Collapse
Affiliation(s)
- Petr Fisara
- MSD Animal Health26 Artisan Road, Seven Hills, NSW, 2147, Australia
| | - Roger M Sargent
- MSD Animal Health26 Artisan Road, Seven Hills, NSW, 2147, Australia
| | - Michael Shipstone
- Dermatology for Animals263 Appleby Road, Stafford Heights, Qld, 4053, Australia
| | - Andrew von Berky
- von Berky Veterinary Services3 Hawthorne Street, Woody Point, Qld, 4019, Australia
| | - Janet von Berky
- von Berky Veterinary Services3 Hawthorne Street, Woody Point, Qld, 4019, Australia
| |
Collapse
|
14
|
Su LC, Huang CG, Chang ST, Yang SH, Hsu SH, Wu WJ, Huang RN. An improved bioassay facilitates the screening of repellents against cat flea, Ctenocephalides felis (Siphonaptera: Pulicidae). Pest Manag Sci 2014; 70:264-270. [PMID: 23801453 DOI: 10.1002/ps.3554] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 02/21/2013] [Accepted: 03/22/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Repellents are a common method for preventing flea bites, making an effective system for flea repellent screening advantageous. We describe an improved technique to facilitate repellent activity screening of numerous plant-based Ctenocephalides felis (cat flea) repellents. RESULTS Two long strips of filter paper were impregnated with test compounds (dissolved in ethanol) and ethanol only, respectively. After drying, the two filter papers were glued together along the long side and inserted into a glass tube containing non-fed cat fleas. The distribution of cat fleas in each half of the filter paper was recorded after 30 min to calculate repellency. Results showed that the essential oil of Cinnamomum osmophloeum (from leaf), Taiwania cryptomerioides (from heartwood) and Plectranthus amboinicus (from leaf) exhibits repellent activity against cat fleas in a dose dependent manner. Moreover, the repellent activities against cat fleas of 2% trans-cinnamaldehyde (the main constituent of Ci. osmophloeum essential oil) and 0.5% thymol (the main constituent of P. amboinicus essential oil) are 97.6% and 90.6%, and can persist for up to 4 and 8 h, respectively. These results are comparable to those of 15% DEET. CONCLUSION The proposed screening technique can facilitate the pre-screening of numerous flea repellents for further evaluation on animal or human subjects.
Collapse
Affiliation(s)
- Li-Chong Su
- Department of Entomology, National Taiwan University, Taipei, 10617, Taiwan
| | | | | | | | | | | | | |
Collapse
|
15
|
Abstract
This review defines insecticide/acaricide resistance and describes the history, evolution, types, mechanisms, and detection of resistance as it applies to chemicals currently used against fleas and ticks of dogs and cats and summarizes resistance reported to date. We introduce the concept of refugia as it applies to flea and tick resistance and discuss strategies to minimize the impact and inevitable onset of resistance to newer classes of insecticides. Our purpose is to provide the veterinary practitioner with information needed to investigate suspected lack of efficacy, respond to lack of efficacy complaints from their clients, and evaluate the relative importance of resistance as they strive to relieve their patients and satisfy their clients when faced with flea and tick infestations that are difficult to resolve. We conclude that causality of suspected lack of insecticide/acaricide efficacy is most likely treatment deficiency, not resistance.
Collapse
Affiliation(s)
- Tad B Coles
- Medical Writing and Veterinary Consulting, Overland Park, KS 66212, USA
| | - Michael W Dryden
- Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, KS 66506, USA
| |
Collapse
|
16
|
Abstract
Pyrethroid insecticides containing deltamethrin provide broad spectrum insect control that can adversely affect food supplies of insectivorous birds. I hypothesized that this could result in lowered nest survival for a ground-nesting insectivorous bird, the Mountain Plover (Charadrius montanus), which preferentially nests on prairie dog colonies. I studied Mountain Plover nest survival in 2003-2010 at a small cluster of black-tailed prairie dog (Cynomys ludovicianus) colonies in north-central Montana. Three colonies were treated with deltamethrin to control fleas and limit the spread of plague; four untreated colonies served as controls. I monitored 412 plover nests during the 8 year study (264 on treatment colonies and 148 on control colonies) and found a strong negative effect of deltamethrin treatments on nest survival (β(Dust) = -1.24, 95 % CI was -2.00 to -0.48) in the years following the actual treatment (2004-2006). I conclude that the observed treatment effect most likely occurred because of changes in insect (food) availability for the plover, and this in turn lowered nest survival because adults spent more time off nests or switched to less desirable insect prey. These results lend support to the need to consider the indirect effects of insecticide treatments on non-target species and suggest a potential conflict in current plague management strategies for prairie dogs.
Collapse
Affiliation(s)
- Stephen J Dinsmore
- Department of Natural Resource Ecology & Management, Iowa State University, 339 Science II, Ames, IA 50011, USA.
| |
Collapse
|
17
|
Lopes AC, Mounteer AH, Stoppa TV, Aquino DS. Biological activity of bleached kraft pulp mill effluents before and after activated sludge and ozone treatments. Water Sci Technol 2013; 67:333-9. [PMID: 23168632 DOI: 10.2166/wst.2012.567] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Eucalyptus bleached kraft pulp production, an important sector of the Brazilian national economy, is responsible for generating large volume, high pollutant load effluents, containing a considerable fraction of recalcitrant organic matter. The objectives of this study were to quantify the biological activity of the effluent from a eucalyptus bleached kraft pulp mill, characterize the nature of compounds responsible for biological activity and assess the effect of ozone treatment on its removal. Primary and secondary effluents were collected bimonthly over the course of one year at a Brazilian bleached eucalypt kraft pulp mill and their pollutant loads (biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), adsorbable organic halogen (AOX), lignin, extractives) and biological activity (acute and chronic toxicity and estrogenic activity) quantified. The effluent studied did not present acute toxicity to Daphnia, but presented the chronic toxicity effects of algal growth inhibition and reduced survival and reproduction in Ceriodaphnia, as well as estrogenic activity. Chronic toxicity and estrogenic activity were reduced but not eliminated during activated sludge biological treatment. The toxicity identification evaluation revealed that lipophilic organic compounds (such as residual lignin, extractives and their byproducts) were responsible for the toxicity and estrogenic activity. Ozone treatment (50 mg/L O(3)) of the secondary effluent eliminated the chronic toxicity and significantly reduced estrogen activity.
Collapse
Affiliation(s)
- Alessandra Cunha Lopes
- Civil Engineering Department, Federal University of Viçosa, 36570-000 Viçosa, Minas Gerais, Brazil
| | | | | | | |
Collapse
|
18
|
Bigelow Dyk M, Liu Y, Chen Z, Vega H, Krieger RI. Fate and distribution of fipronil on companion animals and in their indoor residences following spot-on flea treatments. J Environ Sci Health B 2012; 47:913-24. [PMID: 22938575 DOI: 10.1080/03601234.2012.706548] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Use of fipronil {5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-trifluoromethyl)sulfinyl]-1H-pyrazole-3-carbonitrile CAS 120068-37-3} topical pet products on dogs and cats introduces low level residues into residences. Distribution and fate studies of fipronil on pets and in residences were performed to evaluate potential determinants of human exposure. Fipronil, desulfinyl fipronil, fipronil sulfone and fipronil sulfide were measured on hair clippings and brushed hair. The derivatives usually represented <10% of fipronil applied. Cotton gloves worn over impervious nitrile gloves, cotton cloths placed indoors in locations frequented by pets, and cotton socks worn by residents as direct dosimeters collected fipronil and its derivatives listed above in low amounts during 4-week study periods. Subsequent acid hydrolysis urine biomonitoring did not reveal significant excretion of biomarkers at ppb levels. The human exposure potential of fipronil is low relative to levels of health concern.
Collapse
Affiliation(s)
- Melinda Bigelow Dyk
- Personal Chemical Exposure Program, Environmental Toxicology Graduate Program Department of Entomology, University of California, Riverside, California, USA
| | | | | | | | | |
Collapse
|
19
|
Soliman MI, Mikhail MW. Field studies on dominant rodents and the efficacy of certain insecticides to their fleas in Dakahlia Governorate, Egypt. J Egypt Soc Parasitol 2011; 41:315-326. [PMID: 21980770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A preliminary survey of domestic rodent and the efficacy of bendiocarb, diazinon and pirimiphos-methyl insecticides to their fleas were carried out in Dakahlia Governorates (Aga, Meet-Ghamr, El-Senbellawen, Temi El-Amded, Beni-Abed, Dekernes, Nabarow, Talkha, Menia El-Nasr and El-Kordy). Rodent index (number of rodent/trap) and percentage frequency of drodent species were recorded from October 2010 to May 2011. The main rodent species found were the Norway rat, Rattus norvegicus, the grey-bellied rat, R. rattus alexandrinus, the white-bellied rat, R. r. frugivorus and the house mouse, Mus musculus. The rodent index at Beni-Abed, Nabarow, Meet-Ghamr, Dekernes and El-Kordy centers showed 0.46, 0.39, 0.34, 0.33 & 0.33, respectively, while Menia El-Nasr center showed the lowest (0.08). Aga, Talkha, El-Senbellawen, and Temi El-Amded centers showed moderate (0.25, 0.21, 0.2 & 0.16, respectively). The commonest flea species was the oriental rat flea, Xenopsylla cheopis, the mouse flea, Leptopsylla segnis, the dog flea, Ctenocephalides canis and the sticktight flea Echidnophaga gallinacea. The highest number of fleas was on R. norvegicus (Flea index=10.9) while lowest number was on Mus musculus (Flea index=0.1). X. cheopis was the highest frequency distributed for all domestic rodent species (60.9%), while, C. canis was the lowest (1.6%). The results showed that bendiocarb was effective (Lc50=0.389%) than diazinon (Lc50=1.039%) and pirimiphosmethyl (Lc50=2.056 %).
Collapse
|
20
|
Dryden MW, Carithers D, Murray MJ. Flea control: real homes, real problems, real answers, real lessons: hitchhiker fleas and the indoor-only cats. Compend Contin Educ Vet 2011; 33:E4. [PMID: 23713147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
|
21
|
Jachowski DS, Skipper S, Gompper ME. Field evaluation of imidacloprid as a systemic approach to flea control in black-tailed prairie dogs, Cynomys ludovicianus. J Vector Ecol 2011; 36:100-107. [PMID: 21635647 DOI: 10.1111/j.1948-7134.2011.00146.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Epizootic outbreaks of sylvatic plague have dramatically influenced prairie dog (Cynomys sp.) populations across North America. While a great deal of debate surrounds the cause and persistence of plague, flea control can stop the spread of plague epizootic outbreaks and even increase prairie dog survival under non-epizootic conditions. We investigated a newly-developed imidacloprid-treated grain bait that could potentially reduce flea infestations and mitigate the effects of plague on black-tailed prairie dogs (C. ludovicianus). We used a study design involving randomly assigned experimental and control study plots to assess the effectiveness of the systemic flea control product. We observed a significant difference in flea prevalence and abundance between experimental and control sites on three of the four sites treated with a single application of imidacloprid-treated grain bait for up to 90 days post-treatment. We observed an even greater reduction in flea infestations following the double application of treatment bait on two of three additional experimental sites. While we were unable to reduce flea infestations to the extent reported for more commonly used topical insecticides containing deltamethrin, imidacloprid might still be effective at reducing the risk of plague and halting epizootics. In addition, this systemic product can be more rapidly applied than topical insecticides, providing managers with a tool to quickly reduce flea infestations. Future research is needed to evaluate the effectiveness of different application timing and rates, the utility of the product in limiting plague, and the potential effects on non-target species that might also consume the treated bait.
Collapse
Affiliation(s)
- David S Jachowski
- U.S. Fish and Wildlife Service, South Dakota Ecological Services Field Office, Pierre, SD 57501, USA
| | | | | |
Collapse
|
22
|
Dryden MW, Carithers D, Murray MJ. Flea control: real homes, real problems, real answers, real lessons: where are all these fleas coming from? Compend Contin Educ Vet 2011; 33:1-E8. [PMID: 23705156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
|
23
|
Theepharaksapan S, Chiemchaisri C, Chiemchaisri W, Yamamoto K. Removal of pollutants and reduction of bio-toxicity in a full scale chemical coagulation and reverse osmosis leachate treatment system. Bioresour Technol 2011; 102:5381-5388. [PMID: 21147528 DOI: 10.1016/j.biortech.2010.11.091] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Revised: 11/19/2010] [Accepted: 11/22/2010] [Indexed: 05/30/2023]
Abstract
Removals of pollutants and toxic organic compounds and reduction in bio-toxicity of leachate along an operating full-scale leachate treatment system utilizing chemical coagulation, sand filtration, microfiltration (MF) and reverse osmosis (RO) membrane were evaluated. High pollutant removals were achieved mainly by coagulation and sand filtration. Major toxic organic pollutants, i.e. DEHP, DBP and bisphenol A were removed by 100%, 99.6% and 98.0%. Acute toxicity test using water flea, Nile Tilapia and common carp and genotoxicity (Comet assay) were conducted to determine toxicity reduction in leachate along the treatment. Ammonia was found to be the main acute toxic compounds in leachate as determined by LC(50) but the effect of organic substances was also observed. DNA damage in fish exposed to diluted raw leachate (10% of LC(50)) was found to be 8.9-24.3% and it was subsequently decreased along the treatment. Correlation between pollutants and its bio-toxicity was established using multivariable analyses.
Collapse
Affiliation(s)
- S Theepharaksapan
- National Center of Excellence for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok 10400, Thailand.
| | | | | | | |
Collapse
|
24
|
Sõukand R, Kalle R, Svanberg I. Uninvited guests: traditional insect repellents in Estonia used against the clothes moth Tineola bisselliella, human flea Pulex irritons and bedbug Cimex lectularius. J Insect Sci 2010; 10:150. [PMID: 21070174 PMCID: PMC3016901 DOI: 10.1673/031.010.14110] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Extensive folklore records from pre-modern Estonia give us an excellent opportunity to study a variety of local plant knowledge and plant use among the peasantry in various parts of the country. One important biocultural domain where plant knowledge has been crucial was in the various methods of combating different ectoparasites that cohabited and coexisted with humans and their domestic animals. Some of these methods were widely known (world-wide, Eurasia, Europe, Baltic Rim), while others were more local. Here we discuss ways of reducing clothes moths Tineola bisselliella (Hummel) (Lepidoptera: Tineidae), human fleas Pulex irritons L. (Siphonaptera: Pulicidae) and bedbugs Cimex lectularius L. (Hemiptera: Cimicidae) with the help of plants. Various taxa used as traditional repellents have been identified. The use of plants as repellents and their toxic principles are also discussed from a comparative perspective.
Collapse
Affiliation(s)
- Renata Sõukand
- Tartu University, Institute of Philosophy and Semiotics, Department of Semiotics, Tiigi 78, Tartu, Estonia
- Estonian Literary Museum, Vanemuise 42, Tartu, Estonia
| | - Raivo Kalle
- Estonian Literary Museum, Vanemuise 42, Tartu, Estonia
| | - Ingvar Svanberg
- Uppsala Centre for Russian and Eurasian Studies, Uppsala University, Box 514, 751 20 Uppsala, Sweden
| |
Collapse
|
25
|
Affiliation(s)
- Byron L Blagburn
- Department of Pathobiology, 166 Greene Hall, College of Veterinary Medicine, Auburn University, Auburn AL 36849-5519, USA.
| | | |
Collapse
|
26
|
Nikitin AI, Kardash AI. [A possibility of using some pyrethroids to prevent plague in the Siberian natural foci of the souslik type]. Med Parazitol (Mosk) 2009:42-44. [PMID: 20120377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Experiments have established that the pyrethroids deltamethrin and cypermethrin (decis and cimbush) may be used in the Siberian natural plague foci for not only emergency, but also early prevention of plague. This substantially expands and simplifies the possibility of organizing disinfection actions and reduces the cost of treatments. The findings are determined by the specific features of the biology and ecology of fleas inhabiting in the natural plague foci of the souslik type in a continental climate area. The specific features include the coincidence of preimago stages and the larger proportion of an adults to rodent nests; the low migration of imagoes from the inhabiting nests to the ground surface, only one insect generation that can develop within a comparatively short (4-5-month) warm period of a year.
Collapse
|
27
|
Farkas R, Gyurkovszky M, Solymosi N, Beugnet F. Prevalence of flea infestation in dogs and cats in Hungary combined with a survey of owner awareness. Med Vet Entomol 2009; 23:187-194. [PMID: 19712149 DOI: 10.1111/j.1365-2915.2009.00798.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A survey was conducted in order to gain current information on flea species (Siphonaptera: Pulicidae) infesting dogs and cats living in urban and rural areas of Hungary, along with data on the factors that affect the presence, distribution and seasonality of infestation. In addition, owner awareness of flea infestation was evaluated. Practitioners in 13 veterinary clinics were asked to examine all dogs and cats attending the clinic and to collect fleas, when present, on 2 days in each month from December 2005 to November 2006. They also completed a questionnaire for each animal examined. A total of 319 dogs (14.1%) were found to be infested; the highest prevalence (27.1%) of infestation on dogs occurred in August and the lowest (5.4%) in May. Prevalence of fleas on cats was higher (22.9%); the highest (35.0%) and lowest (8.1%) prevalences occurred in July and April, respectively. Fleas were more prevalent in rural (387/1924 animals, 20.2%) than in urban (161/1343 animals, 12.0%) areas. Three species, Ctenocephalides felis (Bouché), Ctenocephalides canis (Curtis) and Pulex irritans L., were found. On dogs, the prevalence of C. canis alone was 53.0%, whereas that of C. felis alone was 36.0%. Only 19 specimens of P. irritans were found on 14 dogs from rural habitats only. Prevalence of C. felis only on cats was 94.3%; the remaining cats were infested with either C. canis or with mixed infestations of C. felis and C. canis. More than half (51.4%) of the owners of infested dogs and cats had not used flea control products in the past year or more, and five times as many owners in rural than urban areas had not used flea control products in the same period. Very few owners reported having attempted to kill fleas in their animals' environment; instead, they believed that fleas were acquired from other cats or dogs.
Collapse
Affiliation(s)
- R Farkas
- Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary.
| | | | | | | |
Collapse
|
28
|
Murphy M, Ball CA, Gross S. Comparative in vivo adulticidal activity of a topical dinotefuran versus an imidacloprid-based formulation against cat fleas (Ctenocephalides felis) on cats. Vet Ther 2009; 10:9-16. [PMID: 19742443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Fleas cause significant discomfort to pet cats and distress to their owners and are also vectors of disease severe infestations can cause anemia or flea allergy dermatitis and can lead to infections with Dipylidium caninum and Bartonella henselae. Rapid flea kill is an important feature of flea preventives. The efficacy of dinotefuran (Vectra for Cats and Kittens, Summit VetPharm) was compared with that of imidacloprid (Advantage, Bayer Animal Health) against Ctenocephalides felis when applied topically once on day 0. Cats were infested with 100 (+-3) C. felis on study days -1, 8, 15, 22, and 29. Live fleas were counted on study days 0 (2, 6, and 12 hours after treatment), 9, 16, 23, 29 (2, 6, and 12 hours after infestation), and 30. Cats treated with dinotefuran had significantly (P less than .05) fewer fleas than the control cats at all posttreatment examinations except day 29 at 2 hours after infestation and significantly (P less than .05) fewel fleas than cats treated with imidacloprid on days 0 (2 hours after treatment), 9, 16, 23, 29 (6 and 12 hours after infestation), and 30.
Collapse
Affiliation(s)
- Martin Murphy
- Charles River Laboratories Preclinical Services Ireland, Carrentrila, Ballina, Co. Mayo, Ireland
| | | | | |
Collapse
|
29
|
Franc M, Bouhsira E. Efficacy of a combination of a fipronil-(S)-methoprene spot-on formulation and a deltamethrin-impregnated collar in controlling fleas and sandflies on dogs. Vet Ther 2009; 10:71-77. [PMID: 19742450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This study investigated the use of two commercial products, a deltamethrin-impregnated collar and a fipronil-(S)-methoprene spot-on formulation, in combination to protect dogs against sandflies and fleas when they live in or travel to leishmaniasis-enzootic areas. Interactions, tolerance, and efficacy were evaluated. The combination was well tolerated by the six treated dogs. The antifeeding effect on Phlebotomus perniciosus ranged from 89.6% (day 1) to 99.51% (day 21) and exceeded 95% from day 7 through the end of the study; the mortality effect against P. perniciosus ranged from 87.52% (day 22) to 96.82% (day 15). The combination was 100% effective in controlling Ctenocephalides felis felis infestations for 36 days after treatment. These results suggest that it is feasible and advantageous to combine these two commercial products to protect dogs against sandflies and fleas in leishmaniasis-enzootic areas.
Collapse
Affiliation(s)
- M Franc
- Ecole Nationale Veterinaire de Toulouse, Toulouse, France
| | | |
Collapse
|
30
|
Davis RM, Cleugh E, Smith RT, Fritz CL. Use of a chitin synthesis inhibitor to control fleas on wild rodents important in the maintenance of plague, Yersinia pestis, in California. J Vector Ecol 2008; 33:278-284. [PMID: 19263847 DOI: 10.3376/1081-1710-33.2.278] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A study was designed to test the insect development inhibitors fluazuron and lufenuron for the control of fleas on sylvatic rodents as an adjunct to the control of plague. Historical data of flea burden from 15 prior years of study at Chuchupate Campground, Ventura County, CA, were compared to six years of treatment period data to determine if fluazuron and lufenuron were effective in controlling flea densities. The insect development inhibitors, delivered systemically via a feed cube, reduced flea loads effectively on California ground squirrels (Spermophilus beecheyi), long-eared woodrats (Neotoma macrotis), and mice (Peromyscus spp.) but not on Merriam's chipmunks (Tamias merriami).
Collapse
Affiliation(s)
- Richard M Davis
- Vector-Borne Disease Section, California Department of Public Health, 342 Tyrus Court, Nipomo, CA 93444, USA
| | | | | | | |
Collapse
|
31
|
Ribeiro FDA, Correia TR, Fernandes JI, Melo RMPDS, Vieira VPDC, Bezerra LDL, Scott FB. [Activity of neem extract on the embryonary development of Ctenocephalides felis felis (Bouché, 1835) (Siphonaptera: Pulicidae)]. Rev Bras Parasitol Vet 2008; 17 Suppl 1:87-91. [PMID: 20059823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 09/14/2008] [Indexed: 05/28/2023]
Abstract
The present study had as objective to evaluate the activity of limonoid azadiractin, extracted of the seeds of the plant Azadirachta indica, neem, on the embryonary development of Ctenocephalides felis felis. A dog was sprayed with the formulation 10%, another dog was kept as control, without treatment. Both had been infested weekly with 600 fleas, in the ratio of 1:1 between males and females. The deriving positions of the infestations had been incubate per seven days in assay pipes, and evaluated it percentage of emerging of flea eggs, comparing themselves the averages of the groups treat and have controlled. The extract of nim presented activity on the embryonary development of C. f. felis, keeping superior levels of effectiveness 80% until day +14, beyond diminishing the position and inhibiting the development between urging larval of the percentage of larvae that had come out.
Collapse
Affiliation(s)
- Francisco De Assis Ribeiro
- Instituto de Veterinária.Universidade Federal do Rio de Janeiro, Km 7 da BR 465, Seropédica, RJ 23890-000, Brazil
| | | | | | | | | | | | | |
Collapse
|
32
|
Knodel JJ, Olson DL, Hanson BK, Henson RA. Impact of planting dates and insecticide strategies for managing crucifer flea beetles (Coleoptera: Chrysomelidae) in spring-planted canola. J Econ Entomol 2008; 101:810-821. [PMID: 18613582 DOI: 10.1603/0022-0493(2008)101[810:iopdai]2.0.co;2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Integration of cultural practices, such as planting date with insecticide-based strategies, was investigated to determine best management strategy for flea beetles (Phyllotreta spp.) (Coleoptera: Chrysomelidae) in canola (Brassica napus L.). We studied the effect of two spring planting dates of B. napus and different insecticide-based management strategies on the feeding injury caused by fleabeetles in North Dakota during 2002-2003. Adult beetle peak emergence usually coincided with the emergence of the early planted canola, and this resulted in greater feeding injury in the early planted canola than later planted canola. Use of late-planted canola may have limited potential for cultural control of flea beetle, because late-planted canola is at risk for yield loss due to heat stress during flowering. Flea beetle injury ratings declined when 1) the high rate of insecticide seed treatment plus a foliar insecticide applied 21 d after planting was used, 2) the high rate of insecticide seed treatment only was used, or 3) two foliar insecticide sprays were applied. These insecticide strategies provided better protection than the low rates of insecticide seed treatments or a single foliar spray, especially in areas with moderate-to-high flea beetle populations. The foliar spray on top of the seed treatment controlled later-emerging flea beetles as the seed treatment residual was diminishing and the crop became vulnerable to feeding injury. The best insecticide strategy for management of flea beetle was the high rate of insecticide seed treatment plus a foliar insecticide applied at 21 d after planting, regardless of planting date.
Collapse
Affiliation(s)
- Janet J Knodel
- Department of Entomology, Hultz Hall, North Dakota State University, Fargo, North Dakota 58105-5346, USA.
| | | | | | | |
Collapse
|
33
|
Wenzel U, Heine J, Mengel H, Erdmann F, Schaper R, Heine S, Daugschiess A. Efficacy of imidacloprid 10%/moxidectin 1% (Advocate®/Advantage Multi™) against fleas (Ctenocephalides felis felis) on ferrets (Mustela putorius furo). Parasitol Res 2008; 103:231-4. [PMID: 18386063 DOI: 10.1007/s00436-008-0955-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2008] [Accepted: 03/04/2008] [Indexed: 11/25/2022]
Affiliation(s)
- Ulf Wenzel
- Veterinary Practice Dr. Wenzel, Helenenstr. 26a, Leipzig, Germany
| | | | | | | | | | | | | |
Collapse
|
34
|
Schnieder T, Wolken S, Mencke N. Comparative efficacy of imidacloprid, selamectin, fipronil-(S)-methoprene, and metaflumizone against cats experimentally infested with Ctenocephalides felis. Vet Ther 2008; 9:176-183. [PMID: 19003778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Four active ingredients--imidacloprid selamectin, fipronil-(S)-methoprene, and metaflumizone--were tested to assess the speed of flea kill against existing flea infestations and subsequent reinfestations. Thirty flea-infested cats were allocated to four treatment groups and one untreated control group. Flea counts were performed 6, 18, and 48 hours after treatment (day 0) and 2, 4, and 24 hours after weekly flea reinfestations. Cats were also reinfested with fleas after the 6- and 18-hour counts on day 0 and after the 2- and 4-hour counts on subsequent count days. Imidacloprid provided significantly greater flea kill at diverse time points. At the 24-hour counts, all compounds showed expected and similar high efficacies. On study day 34, imidacloprid showed the highest efficacy at 24 hours after reinfestation, with 90.8% flea reduction compared with 55.7% to 67.4% in the other treatment groups. A single topical application of imidacloprid provided a high efficacy in the early elimination of adult fleas, limiting the risk of pathogen transmission and flea allergy dermatitis.
Collapse
Affiliation(s)
- T Schnieder
- University of Veterinary Medicine Hannover, Bünteweg 17, Hannover, Germany
| | | | | |
Collapse
|
35
|
Dolan MC, Dietrich G, Panella NA, Montenieri JA, Karchesy JJ. Biocidal activity of three wood essential oils against Ixodes scapularis (Acari: Ixodidae), Xenopsylla cheopis (Siphonaptera: Pulicidae), and Aedes aegypti (Diptera: Culicidae). J Econ Entomol 2007; 100:622-5. [PMID: 17461093 DOI: 10.1603/0022-0493(2007)100[622:baotwe]2.0.co;2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The biocidal activity of three steam distilled wood essential oils-incense cedar, Calocedrus decurrens (Torr.) Florin; Port-Orford-cedar, Chamaecyparis lawsoniana (A. Murr.) Parl.; and western juniper, Juniperus occidentalis (Hook)--were evaluated against adult Aedes aegypti (L.) (Diptera: Culicidae) and Xenopsylla cheopis (Rothchild) (Siphonaptera: Pulicidae) and nymphal Ixodes scapularis Say (Acari: Ixodidae). In vitro laboratory bioassays were conducted to establish baseline dose-mortality data through 24 h. Incense cedar heartwood was the most toxic to all three vector species followed in order of activity by western juniper and Port-Orford-cedar based on LC50 and LC90 values. Ae. aegypti were substantially more susceptible to the oils than either I. scapularis or X. cheopis.
Collapse
Affiliation(s)
- Marc C Dolan
- Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, P.O. Box 2087, Fort Collins, CO 80522, USA.
| | | | | | | | | |
Collapse
|
36
|
Franc M, Beugnet F, Vermot S. Efficacy of fipronil-(S)-methoprene on fleas, flea egg collection, and flea egg development following transplantation of gravid fleas onto treated cats. Vet Ther 2007; 8:285-292. [PMID: 18183547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The goal of this study was to assess the insect growth regulator activity of the combination product fipronil-(S)-methoprene under a severe challenge model. Gravid fleas were allowed to feed on untreated donor cats for 48 hours before being transplanted onto untreated control cats and treated cats (treated once on day 0); 24 hours later, adult fleas were collected from all cats and counted to assess the 24-hour kill efficacy against the transplanted fleas, and flea eggs were collected and incubated to assess viability. The process was repeated weekly for 11 weeks. The 24-hour efficacy against transplanted adult fleas in the treated group was about 100% for the first 3 weeks and gradually declined to 93.4% by week 6. Egg production numbers were reduced on the treated cats compared with controls, with geometric mean egg counts on treated cats reduced from 76.9% to 96.3% during the initial 6 weeks of the study. The combination product was 100% ovicidal through day 56 and was still about 98% effective against eggs at the end of the study (day 76).
Collapse
Affiliation(s)
- M Franc
- l'UMR181 Physiopathologie et Toxicologie Esperimentales, INRA, ENVT, Toulouse, France
| | | | | |
Collapse
|
37
|
Dryden M, Payne P, Smith V. Efficacy of selamectin and fipronil-(S)-methoprene spot-on formulations applied to cats against adult cat fleas (Ctenocephalides felis), flea eggs, and adult flea emergence. Vet Ther 2007; 8:255-262. [PMID: 18183544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A study was conducted to evaluate the efficacy of selamectin and fipronil-(S)-methoprene against adult cat fleas (Ctenocephalides felis), flea egg production, and the viability of flea eggs collected from treated cats. Cats were infested with approximately 50 adult fleas 2 days before treatment and weekly thereafter; flea eggs were collected and counted on days 0, 1, 2, and 3 and 48 and 72 hours after each weekly flea infestation. Live fleas were collected approximately 72 hours after treatment or infestation. Compared with fipronil-(S)-methoprene, selamectin provided significantly greater control of adult fleas from days 24 to 31 and significantly greater reduction in egg production from days 16 to 45. For the most part, both products significantly impacted larval and adult emergence for the entire 6-week study, with fipronil-(S)-methoprene providing significantly greater reduction in larval and adult emergence at week 6.
Collapse
Affiliation(s)
- Michael Dryden
- Department of Diagnostic Medicine/Pathology, Colleg of Veterinary Medicine, Kansas State University, Manhattan 66503, USA
| | | | | |
Collapse
|
38
|
Franc M, Yao KP. Comparison of the activity of selamectin, imidacloprid and fipronil for the treatment of cats infested experimentally with Ctenocephalides felis felis and Ctenocephalides felis strongylus. Vet Parasitol 2006; 143:131-3. [PMID: 17034950 DOI: 10.1016/j.vetpar.2006.09.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Revised: 08/16/2006] [Accepted: 09/07/2006] [Indexed: 11/16/2022]
Abstract
Twenty adult, domestic short hair cats were randomly allocated into four groups of five cats and housed in separated cages. Each cat was infested with 25 fleas Ctenocephalides felis felis and 25 Ctenocephalides felis strongylus and 2 days later (day 0) the cats in group 1, 2 and 3 received a spot on application of selamectin, imidacloprid or fipronil, respectively, while the cats in group four were not treated. The cats were combed 48 h later, the fleas were removed, counted and their subspecies were determined. All the cats were reinfested with the same number of the two subspecies of fleas on days 7, 14, 21, 29 and 35. The efficacy of each treatment was calculated 48 h after each infestation. The mean number of fleas on the control cats was 16.4 C. f. felis and 13.4 C. f. strongylus. The three treatments were effective for the first 31 days for C. f. felis and for the full 37 days for C. f. strongylus. Over the first 31 days, the efficacy of selamectin ranged from 89 to 100% and 85 to 100% against C. f. felis and C. f. strongylus, respectively, the efficacy of imidacloprid ranged from 76 to 100% and 92 to 100% and the efficacy of fipronil ranged from 98 to 100% and 97 to 100% against C. f. felis and C. f. strongylus. There were no significant differences between the control of C. f. felis and C. f. strongylus by the three products.
Collapse
Affiliation(s)
- M Franc
- UMR 181, Ecole Nationale Vétérinaire de Toulouse 23 chemin des capelles 31076 Toulouse Cedex, France.
| | | |
Collapse
|
39
|
Beck W, Pfister K. [Questionnaire on the incidence and control of fleas in dogs and cats presented to German small animal practices]. Berl Munch Tierarztl Wochenschr 2006; 119:355-9. [PMID: 17009722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
2590 small animal practitioners in Germany have been asked by a questionnaire from which 1694 (65.4%) replied. 1186 of these veterinarians (70%) often see ectoparasite infestation. Fleas are predominant and occur on cats (1016/60%), followed by dogs (424/25%), small mammals and birds (254/15%). Flea infestations on dogs and cats are observed throughout the year, but the prevalences are generally higher during the summer season. The results reveal that topically administered spot-on formulations is the most popular method used for flea control. The most common applied antiparasitic substances both in dogs and in cats were fipronil (535/31.6%; 690/40.7%), imidacloprid (290/17.1%; 417/24.6%) and selamectin (267/15.8%; 319/18.8%). Due to 771 (45.5%) of the answering veterinarians the animal owner himself, and according 694 (41%) respectively 229 (13.5%) of the replies the veterinarian or the veterinary technician applies the antiparasiticide onto the skin. 1457 veterinarians (86%) administer compounds against adult fleas and their developmental stages also in the animal's environment.
Collapse
Affiliation(s)
- Wieland Beck
- Institut für Vergleichende Tropenmedizin und Parasitologie, Tierärztliche Fakultät der Ludwig-Maximilians-Universität München.
| | | |
Collapse
|
40
|
Abstract
[structure: see text] A stereocontrolled total synthesis of (+)-nodulisporic acid F, the simplest member of a family of novel ectoparasiticidal agents, has been achieved. Highlights of the effective modular synthetic strategy include anionic union of a tricyclic lactone with o-toluidine via our 2-substituted indole synthetic protocol, an optimized C-ring construction protocol, and a late-stage installation of the alpha,beta-unsaturated carboxylic acid side chain via the B-alkyl Suzuki-Miyaura cross-coupling tactic.
Collapse
Affiliation(s)
- Amos B Smith
- Department of Chemistry, Monell Chemical Senses Center and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
| | | | | |
Collapse
|
41
|
Abstract
Host age is one of the key factors in host-parasite relationships as it possibly affects infestation levels, parasite-induced mortality of a host, and parasite distribution among host individuals. We tested two alternative hypotheses about infestation pattern and survival under parasitism in relation to host age. The first hypothesis assumes that parasites are recruited faster than they die and, thus, suggests that adult hosts will show higher infestation levels than juveniles because the former have more time to accumulate parasites. The second hypothesis assumes that parasites die faster than they are recruited and, thus, suggests that adults will show lower infestation levels because of acquired immune response and/or the mortality of heavily infested juveniles and, thus, selection for less infested adults. As the negative effects of parasites on host are often intensity-dependent, we expected that the age-related differences in infestation may be translated to lower or higher survival under parasitism of adults, in the cases of the first and the second hypotheses, respectively. We manipulated ectoparasite numbers using insecticide and assessed the infestation pattern in adult and juvenile gerbils (Gerbillus andersoni) in the Negev Desert. We found only a partial support for age-dependent parasitism. No age-related differences in infestation and distribution among host individuals were found after adjusting the ectoparasite numbers to the host's surface area. However, age-related differences in survival under parasitism were revealed. The survival probability of parasitized juveniles decreased in about 48% compared to unparasitized hosts while the survival probability of adults was not affected by ectoparasites. Our results suggest that the effect of host age on host-parasite dynamics may not explicitly be determined by age-dependent differences in ectoparasite recruitment or mortality processes but may also be affected by other host-related and parasite-related traits.
Collapse
Affiliation(s)
- Hadas Hawlena
- Department of Life Sciences and Ramon Science Center, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84105, Beer-Sheva, Israel.
| | | | | |
Collapse
|
42
|
Blagburn BL, Dryden MW, Payne P, Rust MK, Jacobs DE, Bond R, Hutchinson MJ, Denholm I, Mehlhorn H, Vaughn M, Mencke N, Schroeder I, Hostetler J, Endrizzi M. New methods and strategies for monitoring susceptibility of fleas to current flea control products. Vet Ther 2006; 7:86-98. [PMID: 16871490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A flea larval bioassay was developed by an international team of scientists to monitor the susceptibility of fleas (Ctenocephalides felis) to imidacloprid (Advantage, Bayer HealthCare). The assay was validated using laboratory and field isolates of C. felis. Flea eggs representing different field isolates of C. felis were collected by veterinarians in the United States, United Kingdom, and Germany. Of the 972 flea isolates obtained during the 5-year study, 768 contained sufficient numbers of eggs to conduct the larval bioassay. Greater than 5% survival occurred for only six of the field isolates evaluated. Further evaluation and analysis of these isolates demonstrated that they did not differ significantly in their susceptibility to imidacloprid from the reference strains used to develop the assay. Collections of field flea isolates will continue in an attempt to detect and document any change in the susceptibility of field flea populations to imidacloprid.
Collapse
Affiliation(s)
- Byron L Blagburn
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Hussein KT. Evaluation of the efficacy of dill apiol and pyriproxyfen in the treatment and control of Xenopsylla cheopis flea Roths (Siphonaptera: Pulicidae). J Egypt Soc Parasitol 2005; 35:1027-36. [PMID: 16333908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The effect of LC50 of the isolated dill apiol compound and pyriproxyfen caused significant prolongation in the first gonotrophic cycle and great reduction in the percentage of female (Xenopsylla cheopis) reproductive potential as well as egg hatchability. The results indicated that, the larval treatments inhibited the ovarian development and evolved drastic changes in the ovarian histology and histochemistry. The two tested compounds reduced the vitellogenesis and synthesis of carbohydrates, protein, DNA & RNA materials and lipids in oocytes. The two compounds are similar in their mode and site of action.
Collapse
Affiliation(s)
- Karam T Hussein
- Department of Zoology, Faculty of Science, Zagazig University, Zagazig, Egypt
| |
Collapse
|
44
|
Klimpel S, Mehlhorn H, Heukelbach J, Feldmeier H, Mencke N. Field trial of the efficacy of a combination of imidacloprid and permethrin against Tunga penetrans (sand flea, jigger flea) in dogs in Brazil. Parasitol Res 2005; 97 Suppl 1:S113-S119. [PMID: 16228267 DOI: 10.1007/s00436-005-1454-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In a field trial in Brazil 17 dogs penetrated by females of the jigger flea, Tunga penetrans, were topically treated with a combination of 10% imidacloprid and 50% permethrin (Advantix), while 17 dogs remained untreated. The follow-up controls on days 7, 14, 21 and 28 post-treatment clearly showed that, beginning from day 7, the flea load in treated dogs decreased, so that most of the dogs became free of tungiasis lesions, while in the untreated group the flea load remained high. Since the dogs distribute the flea eggs throughout the village, leading to a high incidence of tungiasis in humans, treatment of dogs probably also decreases the number of cases of tungiasis in the latter.
Collapse
Affiliation(s)
- S Klimpel
- Institute of Zoomorphology, Cell Biology and Parasitology, Heinrich-Heine-University, 40225, Düsseldorf, Germany
| | - H Mehlhorn
- Institute of Zoomorphology, Cell Biology and Parasitology, Heinrich-Heine-University, 40225, Düsseldorf, Germany.
| | - J Heukelbach
- Department of Community Health, School of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - H Feldmeier
- Department of Medical Microbiology and Immunology of Infection, Institute for Infection Medicine, Charité, Berlin, Germany
| | - N Mencke
- Bayer HealthCare AG, Animal Health Division, Leverkusen, Germany
| |
Collapse
|
45
|
Mehlhorn H, Schmahl G, Schmidt J. Extract of the seeds of the plant Vitex agnus castus proven to be highly efficacious as a repellent against ticks, fleas, mosquitoes and biting flies. Parasitol Res 2005; 95:363-5. [PMID: 15682335 DOI: 10.1007/s00436-004-1297-z] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Accepted: 11/25/2004] [Indexed: 11/29/2022]
Abstract
About 70 plant extracts were tested for their ability to repel the attacks of blood-sucking arthropods. It was found that a CO2 extract of the seeds of the Mediterranean plant Vitex agnus castus (monk's pepper) can be used as a spray to keep away especially Ixodes ricinus and Rhipicephalus sanguineus ticks from animals and humans for at least 6 h. In addition mosquitoes, biting flies and fleas are also repelled for about 6 h.
Collapse
Affiliation(s)
- Heinz Mehlhorn
- Department of Cytology, Zoomorphology and Parasitology, Heinrich-Heine-University, Düsseldorf, Germany.
| | | | | |
Collapse
|
46
|
Dryden MW, Smith V, Payne PA, McTier TL. Comparative speed of kill of selamectin, imidacloprid, and fipronil-(S)-methoprene spot-on formulations against fleas on cats. Vet Ther 2005; 6:228-36. [PMID: 16299669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The speed of kill of selamectin, imidacloprid, and fipronil-(S)-methoprene against Ctenocephalides felis infestations on cats for one month following a single treatment was evaluated. Eighty cats were randomly allocated so that there were 20 cats in four different treatment groups. On Days -2, 7, 14, 21, and 28, each cat was infested with 100 adult C. felis from the Kansas 1 flea strain. Following initial application only imidacloprid had caused a significant reduction in adult fleas on treated cats within 6 hours, but by 24 hours all three formulations had killed 96.7% of the fleas. At 7 days post treatment, all three formulations reduced flea populations within 6 and 24 hours by 68.4% and 99.4%, respectively. At 21 and 28 days after treatment, none of the formulations killed significant numbers of fleas as compared to controls within 6 hours of infestation. At 28 days after treatment, selamectin, fipronil-(S)-methoprene, and imidacloprid had killed 99.0%, 86.4%, and 72.6% of the fleas within 48 hours of infestation, respectively. This study demonstrates that the speed of kill of residual flea products on cats decreases throughout the month following application. It also demonstrated that selamectin provided the highest level of residual activity on cats against the Kansas 1 flea strain.
Collapse
Affiliation(s)
- M W Dryden
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA
| | | | | | | |
Collapse
|
47
|
Abstract
Tungiasis is an ectoparasitosis causing considerable pathology in endemic areas. Standard therapy consists of removing the embedded parasite with a sterile needle. There is no effective chemotherapy at hand. To fill this gap, a double-blinded randomized controlled trial with oral ivermectin was conducted. A total of 54 individuals (27 in the placebo group, 27 in the ivermectin group) was followed up for seven days. They presented a total of 192 lesions. Patients received either ivermectin (300 microg/kg body weight at a single dose, repeated after 24 h) or placebo. Outcome measures included the clinical stage of lesion, presence of erythema, pain, itching, signs of viability of the parasite, and total lysis of flea. The ratio of fleas with total lysis per total number of fleas was slightly higher in the ivermectin group; however, this difference was not statistically significant. There was no significant difference in any of the other outcome measures between the treatment and the placebo group. The results show that oral ivermectin is without any clinically significant efficacy against embedded sand fleas at the dose given.
Collapse
Affiliation(s)
- Jörg Heukelbach
- Departamento de Saúde Comunitária, Faculdade de Medicina, Universidade Federal do Ceará, Rua Prof. Costa Mendes 1608, 60430-140 Fortaleza, CE, Brazil.
| | | | | |
Collapse
|
48
|
Singh SB, Ondeyka JG, Jayasuriya H, Zink DL, Ha SN, Dahl-Roshak A, Greene J, Kim JA, Smith MM, Shoop W, Tkacz JS. Nodulisporic acids D-F: structure, biological activities, and biogenetic relationships. J Nat Prod 2004; 67:1496-1506. [PMID: 15387649 DOI: 10.1021/np0498455] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nodulisporic acids D, E, and F are the newest members of a family of nontremorogenic indole-diterpenoids that are potent, orally bioavailable, antiflea agents derived from a fungus belonging to the genus Nodulisporium. The four members of the D series are each devoid of an isoprene residue that is present at C-26 in the three nodulisporic acids described originally (the A series). Nodulisporic acid E (11a) has a simpler structure, which lacks not only the isoprene residue at C-26 but also two that form the A/B rings. Nodulisporic acid F is the simplest of all nodulisporic acids and is devoid of all three isoprene residues of the indole unit; as such, it represents the earliest biosynthetic intermediate in this series. A biogenetic grid based on mutation studies is proposed that encompasses all the known nodulisporic acids. Structure-activity relationships of the known natural nodulisporic acids have been elucidated. Within a series the most active compound possesses a dienoic acid chain, and overall, the end product of the biogenetic grid, i.e., nodulisporic acid A, exhibits the most potent antiflea activity. Additionally, the stereochemistries of C-3' ' and C-4' ' of nodulisporic acid D(2) and therefore of nodulisporic acids A(2), B(2), and C(2) have been assigned.
Collapse
Affiliation(s)
- Sheo B Singh
- Merck Research Laboratories, P.O. Box 2000, Rahway, New Jersey 07065, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
McTier TL, Evans NA, Martin-Short M, Gration K. Comparison of the activity of selamectin, fipronil, and imidacloprid against flea larvae (Ctenocephalides felis felis) in vitro. Vet Parasitol 2003; 116:45-50. [PMID: 14519326 DOI: 10.1016/s0304-4017(03)00163-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The activity of selamectin, fipronil and imidacloprid against larval cat fleas (Ctenocephalides felis felis) was evaluated in an in vitro potency assay system. One hundred microliters of each compound at various concentrations in acetone were added to glass vials (1.5 by 3 cm) to which had been previously added 20 mg of sand and 10 mg of flea feces. Vials were then ball milled to allow the acetone to evaporate. Selamectin and fipronil were tested at 0.001, 0.003, 0.005, 0.01, 0.03, 0.05, 0.11, 0.3, and 0.5 microg of active compound per tube. Imidacloprid was tested at 0.01, 0.03, 0.05, 0.1, 0.3, 0.5, 1.0, 3.0, and 5.0 microg of active compound per tube. Thirty first instar C. felis larvae were added to each vial. The number of larvae remaining alive in each vial was determined once daily for 72 h. With selamectin, reductions of >/=93.5% were achieved at 24 h after exposure at doses of >/=0.3 microg. In contrast, at 24 h neither fipronil nor imidacloprid reached 90% reduction, even at the highest doses tested (0.5 microg for fipronil and 5.0 microg for imidacloprid). Selamectin was significantly (P</=0.05) more potent than imidacloprid and fipronil at levels >/=0.03 microg. A similar pattern of activity was observed at both 48 and 72 h, but higher percentages of larvae were killed for each of the compounds as the incubation time increased. At 72 h selamectin was significantly (P</=0.05) more potent than imidacloprid at levels of 0.01-0.1 microg and significantly (P</=0.05) more potent than fipronil at levels of 0.003-0.01 microg. Therefore, selamectin was more potent than either fipronil or imidacloprid in killing flea larvae in this in vitro assay system.
Collapse
Affiliation(s)
- T L McTier
- Pfizer Animal Health Group, Veterinary Medicine Research and Development, Eastern Point Road, Mail Stop 8200-40, Groton, CT 06340, USA.
| | | | | | | |
Collapse
|
50
|
Seery DB, Biggins DE, Montenieri JA, Enscore RE, Tanda DT, Gage KL. Treatment of black-tailed prairie dog burrows with deltamethrin to control fleas (Insecta: Siphonaptera) and plague. J Med Entomol 2003; 40:718-722. [PMID: 14596288 DOI: 10.1603/0022-2585-40.5.718] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Burrows within black-tailed prairie dog (Cynomys ludovicianus) colonies on the Rocky Mountain Arsenal National Wildlife Refuge, Colorado, were dusted with deltamethrin insecticide to reduce flea (Insecta: Siphonaptera) abundance. Flea populations were monitored pre- and posttreatment by combing prairie dogs and collecting fleas from burrows. A single application of deltamethrin significantly reduced populations of the plague vector Oropsylla hirsuta, and other flea species on prairie dogs and in prairie dog burrows for at least 84 d. A plague epizootic on the Rocky Mountain Arsenal National Wildlife Refuge caused high mortality of prairie dogs on some untreated colonies, but did not appear to affect nearby colonies dusted with deltamethrin.
Collapse
Affiliation(s)
- David B Seery
- United States Fish and Wildlife Service, Rocky Mountain Arsenal National Wildlife Refuge, Commerce City, CO 80022, USA.
| | | | | | | | | | | |
Collapse
|