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Journal of Clinical Microbiology, April 2001, p. 1221-1226, Vol. 39, No. 4
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.4.1221-1226.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Molecular Evidence of Bartonella spp. in Questing Adult Ixodes pacificus Ticks in California

C. C. Chang,1 B. B. Chomel,1,* R. W. Kasten,1 V. Romano,2 and N. Tietze2

Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis,1 and Santa Clara County Department of Health Services, Wildlife, Unit, Vector Control Section, San Jose,2 California

Received 18 September 2000/Returned for modification 29 November 2000/Accepted 20 January 2001

Ticks are the vectors of many zoonotic diseases in the United States, including Lyme disease, human monocytic and granulocytic ehrlichioses, and Rocky Mountain spotted fever. Most known Bartonella species are arthropod borne. Therefore, it is important to determine if some Bartonella species, which are emerging pathogens, could be carried or transmitted by ticks. In this study, adult Ixodes pacificus ticks were collected by flagging vegetation in three sites in Santa Clara County, Calif. PCR-restriction fragment length polymorphism and partial sequencing of 273 bp of the gltA gene were applied for Bartonella identification. Twenty-nine (19.2%) of 151 individually tested ticks were PCR positive for Bartonella. Male ticks were more likely to be infected with Bartonella than female ticks (26 versus 12%, P = 0.05). None of the nine ticks collected at Baird Ranch was PCR positive for Bartonella. However, 7 (50%) of 14 ticks from Red Fern Ranch and 22 (17%) of 128 ticks from the Windy Hill Open Space Reserve were infected with Bartonella. In these infected ticks, molecular analysis showed a variety of Bartonella strains, which were closely related to a cattle Bartonella strain and to several known human-pathogenic Bartonella species and subspecies: Bartonella henselae, B. quintana, B. washoensis, and B. vinsonii subsp. berkhoffii. These findings indicate that I. pacificus ticks may play an important role in Bartonella transmission among animals and humans.

* Corresponding author. Mailing address: Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616. Phone: (530) 752-8112. Fax: (530) 752-2377 or (530) 752-5845. E-mail: bbchomel{at}ucdavis.edu.

Journal of Clinical Microbiology, April 2001, p. 1221-1226, Vol. 39, No. 4
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.4.1221-1226.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.