Volume 73, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


–like parasites identified in human babesiosis cases in Missouri and Kentucky and in eastern cottontail rabbits () on Nantucket Island, Massachusetts, share identical small subunit ribosomal RNA gene sequences. This sequence is 99.8% identical to that of suggesting that the U.S. parasite may be a causative agent of human and bovine babesiosis in Europe. Holstein-Friesian calves were inoculated with cultured Nantucket Island sp. (NR831) and parasites and monitored by clinical signs, Giemsa-stained blood films, PCR, and culture. The NR831 recipients did not exhibit clinical signs of infection and remained negative for all assays. The recipients developed clinical infections and became positive by all assays. NR831 recipients were fully susceptible upon challenge inoculation with . This study confirms that the Nantucket Island sp. is not conspecific with based on host specificity for cattle.


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  • Received : 17 Jun 2005
  • Accepted : 08 Aug 2005

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