Volume 79, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


A novel species of spotted fever group (SFG) rickettsia, spp. IG-1, was identified and isolated from adult ticks collected from Orchid Island (Lanyu), an islet located in southeastern Taiwan. Serum samples collected from the rodent host and SFG-positive human serum reacted with IG-1 using an immunofluorescence assay (IFA). Pairwise nucleotide sequence analysis of 16S rRNA (), , , , and shows that IG-1 belongs to SFG rickettsiae and had the highest nucleotide sequence similarities to and . Phylogenetic analysis of the , genes and shows that IG-1 is most closely related to . The results showed the sequence divergence of this novel isolate from those rickettsiae previously characterized using the criteria proposed by Fournier and others. Whether IG-1 is pathogenic for humans remains to be studied.


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  • Received : 21 Sep 2007
  • Accepted : 08 May 2008

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