Prevalence of five tick-borne bacterial genera in adult Ixodes scapularis removed from white-tailed deer in western Tennessee

Particle and Fibre Toxicology

Rebecca T Trout Fryxell²  Allan E Houston¹  David J Paulsen²  Brian M Hendricks²  Sarah E Mays² 

[1] Department of Forestry, Fisheries, and Wildlife, University of Tennessee, Tennessee and Ames Plantation, Grand Junction, Knoxville, Tennessee, USA;Department of Entomology and Plant Pathology, University of Tennessee, 370 Plant Biotechnology Building 2505 E J Chapman Drive, Knoxville, TN, USA

关键词: Rickettsia;    Ehrlichia;    Borrelia;    Babesia;    Anaplasma;    Tick-borne disease;    Tennessee;    Ixodes scapularis;   

Others  :  1149731
DOI  :  10.1186/s13071-014-0473-y

 received in 2013-10-24, accepted in 2014-10-02,  发布年份 2014

【 摘 要 】

Background

In the northeastern and midwestern regions of the United States Ixodes scapularis Say transmits the causal agents of anaplasmosis (Anaplasma phagocytophilum), babesiosis (Babesia microti), and borreliosis (Borrelia burgdorferi and B. miyamotoi). In the southeastern United States, none of those pathogens are considered endemic and two other tick-borne diseases (TBDs) (ehrlicihosis and rickettiosis) are more common. Our objective was to determine baseline presence and absence data for three non-endemic bacterial agents (Anaplasma, Borrelia and Babesia) and two commonly reported bacterial agents (Ehrlichia, and Rickettsia) in southern I. scapularis (n = 47) collected from 15 hunter-harvested white-tailed deer (Odocoileus virginianus) in western Tennessee.

Findings

Of the 47 ticks, 27 tested PCR positive for non-pathogenic Rickettsia species, two for Ehrlichia ewingii, one for Ehrlichia sp. ¿Panola Mountain¿, and one for Anaplasma phagocytophilum variant 1 strain. None of these ticks were positive for Babesia or Borrelia (including B. burgdorferi).

Conclusions

Finding human pathogens in host-fed I. scapularis merits additional studies surveying pathogen prevalence in questing ticks. Collection of questing I. scapularis in their peak activity months should be undertaken to determine the overall encounter rates and relative risk of pathogenic Ehrlichia in southern I. scapularis. Ehrlichia sequences were homologous to previous human isolates, but neither Babesia nor B. burgdorferi were identified in these ticks. With the identification of pathogenic bacteria in this relatively small collection of I. scapularis from western Tennessee, the study of the absence of Lyme disease in the south should be refocused to evaluate the role of pathogenic Ehrlichia in southern I. scapularis.

【 授权许可】

   
2014 Mays et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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