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Am. J. Trop. Med. Hyg., 49(2), 1993, pp. 239-244
Copyright © 1993 by The American Society of Tropical Medicine and Hygiene

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Amblyomma americanum: a Potential Vector of Human Ehrlichiosis

Burt E. Anderson, Kimetha G. Sims, James G. Olson, James E. Childs, Joseph F. Piesman, Christine M. Happ, Gary O. Maupin AND Barbara J. B. Johnson
Division of Viral and Rickettsial Diseases, and Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia and Fort Collins, Colorado

Polymerase chain reaction primers specific for Ehrlichia chaffeensis were used to amplify DNA from extracts of pooled ticks. Amplification was performed on extracts from 140 pools (1,579 total ticks) consisting of three tick genera collected from five states. The characteristic 389-basepair product was observed after amplification of extracts from seven different pools of adult Amblyomma americanum (117 pools, 1,462 ticks), but not from pools of nymphs. No specific product was observed after amplification of 20 pools (105 ticks) of Dermacentor variabilis and three pools of Ixodes scapularis (12 ticks). Ehrlichia chaffeensis was present in A. americanum at a minimum frequency of ≥ 0.48%, suggesting that A. americanum may be a vector of human ehrlichiosis.




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Copyright © 1993 by the American Society of Tropical Medicine and Hygiene.