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Updated: Jun 15, 2026

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research
Published on: August 31, 2013
Bartonella spp. transmission by ticks not established
Sam R Telford1, Gary P Wormser
1Tufts University Cummings School of Veterinary Medicine, North Grafton, Massachussetts, USA.
Abstract:
Bartonella spp. infect humans and many animal species. Mainly because PCR studies have demonstrated Bartonella DNA in ticks, some healthcare providers believe that these microorganisms are transmitted by ticks. B. henselae, in particular, is regarded as being present in and transmissible by the Ixodes scapularis tick. The presence of a microbial agent within a tick, however, does not imply that the tick might transmit it during the course of blood feeding and does not confer epidemiologic importance. After a critical review of the evidence for and against tick transmission, we conclude that transmission of any Bartonella spp. by ticks, to animals or humans, has not been established. We are unaware of any well-documented case of B. henselae transmission by I. scapularis ticks.
Insights
Current evidence does not support tick transmission of Bartonella species, including Bartonella henselae, to humans or animals. Despite detection in ticks, tick-borne Bartonella transmission remains unproven.
Area of Science:
- Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Bartonella species are known to infect humans and various animal hosts.
- The presence of Bartonella DNA in ticks, particularly Ixodes scapularis, has led to the hypothesis of tick-borne transmission.
- Bartonella henselae is frequently implicated in potential transmission by Ixodes scapularis.
Purpose of the Study:
- To critically evaluate the evidence supporting tick transmission of Bartonella species.
- To determine the epidemiological significance of Bartonella detection in ticks.
Main Methods:
- A comprehensive review of existing scientific literature on Bartonella and tick interactions.
- Analysis of studies reporting Bartonella DNA in ticks and evidence of transmission.
Main Results:
- Detection of Bartonella DNA in ticks does not confirm transmission during blood feeding.
- No established cases of Bartonella species transmission by ticks to animals or humans were found.
- Specifically, no well-documented instances of Bartonella henselae transmission by Ixodes scapularis were identified.
Conclusions:
- The transmission of Bartonella species by ticks is not scientifically established.
- Further research is needed to clarify the role of ticks, if any, in Bartonella epidemiology.
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