thumbnail

Prevalence of Ehrlichia, Borrelia, and Rickettsial agents in Amblyomma americanum (Acari : Ixodidae) collected from nine states

Journal of Medical Entomology

6645_Mixson.pdf
By:
, , , , , ,

Links

Abstract

Ambyomma antericanum (L.) (Acari: Ixodidae) is an aggressive tick that feeds on humans during all postembryonic life stages. In many regions of the United States, it is the tick most commonly found attached to humans. Public health interest has grown recently, due to the recognition of new human pathogens transmitted by A. antericanum and the expanding distribution of the tick. A. americanum is a vector of several bacteria pathogenic to humans. Ehrlichia chaffeensis and Ehrlichia ewingii cause moderate-to-severe febrile illness. 'Rickettsia amblyommii,' a member of the spotted fever group Rickettsia, also has recently been implicated as a possible human pathogen based on serologic evidence from persons recovering from illness after a tick bite. We have determined the prevalence of infection of Ehrlichia chaffeensis, E. ewingii, 'Borrelia lonestari,' and R. amblyommii within A. americanum ticks from 29 sites in nine states. Overall infection prevalences were 4.7% for E. chaffeensis (range, 0-27%), 3.5% for E. ewingii (range, 0-18.6%), 2.5% for B. lonestari (range, 0-12.2%), and 41.2% for R. amblyommii (range, 0-84.0%). In addition, 87 ticks (4.3%) were infected with two or more bacteria. This report documents new distribution records for E. ewingii, B. lonestari, and R. amblyommii and underscores the nonhomogeneous distribution of pathogen foci of infection. Additional surveillance throughout the range of A. antericanum is warranted to increase physician and public awareness of the risk of disease to humans from exposure to the agents transmitted by this tick.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Prevalence of Ehrlichia, Borrelia, and Rickettsial agents in Amblyomma americanum (Acari : Ixodidae) collected from nine states
Series title:
Journal of Medical Entomology
Volume
43
Issue:
6
Year Published:
2006
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
1261-1268
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1261
Last page:
1268
Number of Pages:
8