Blood Meal Identification in Off-Host Cat Fleas (Ctenocephalides felis) from a Plague-Endemic Region of Uganda

Christine B. Graham Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Jeff N. Borchert Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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William C. Black IV Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Linda A. Atiku Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Joseph T. Mpanga Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Karen A. Boegler Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Sean M. Moore Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Kenneth L. Gage Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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Rebecca J. Eisen Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Uganda Virus Research Institute, Entebbe, Uganda; Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado

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The cat flea, Ctenocephalides felis, is an inefficient vector of the plague bacterium (Yersinia pestis) and is the predominant off-host flea species in human habitations in the West Nile region, an established plague focus in northwest Uganda. To determine if C. felis might serve as a Y. pestis bridging vector in the West Nile region, we collected on- and off-host fleas from human habitations and used a real-time polymerase chain reaction-based assay to estimate the proportion of off-host C. felis that had fed on humans and the proportion that had fed on potentially infectious rodents or shrews. Our findings indicate that cat fleas in human habitations in the West Nile region feed primarily on domesticated species. We conclude that C. felis is unlikely to serve as a Y. pestis bridging vector in this region.

Author Notes

* Address correspondence to Christine B. Graham, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521. E-mail: hyb4@cdc.gov

Authors' addresses: Christine B. Graham, Jeff N. Borchert, Karen A. Boegler, Sean M. Moore, Kenneth L. Gage, and Rebecca J. Eisen, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, E-mails: cgraham@cdc.gov, gqx1@ug.cdc.gov, kje5@cdc.gov, kfy0@cdc.gov, klg0@cdc.gov, and dyn2@cdc.gov. William C. Black IV, Microbiology, Immunology, and Pathology Department, Colorado State University, Fort Collins, CO, E-mail: william.black@colostate.edu. Linda A. Atiku and Joseph T. Mpanga, Uganda Virus Research Institute, Entebbe, Uganda, E-mails: l_atikupraise@yahoo.com and joe1ug@msn.com.

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