Volume 69, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Specific ticks seem to locally serve as vector for characteristic microbial assemblages (guilds) comprising spirochetes, piroplasms, ehrlichiae, and arboviruses. and are intensely transmitted between cottontail rabbits. To test the hypothesis that a piroplasm may also be maintained in rabbits, we sampled these hosts from Nantucket Island, Massachusetts and tested their blood and tissues by a polymerase chain reaction for evidence of infection. Surprisingly, the agent of bovine redwater and of European human babesiosis, , was detected in 16% of the rabbits sampled during 1998–2002 (>99% sequence similarity in the 18S ribosomal DNA). The vector of on Nantucket appears to be , a rabbit- and bird-feeding tick that may feed on humans. Although the risk of human infection appears to be minimal, an autochthonously acquired Kentucky case due to this rabbit agent was recently reported. Physicians should entertain the diagnosis of babesiosis due to for severe hemolytic febrile syndromes in American patients exposed to sites where rabbits are common.


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  • Received : 05 May 2003
  • Accepted : 24 Jul 2003

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