We investigated whether host-seeking nymphs and adults of the western blacklegged tick, Ixodes pacificus Cooley & Kohls, the primary vector of Lyme disease spirochetes in far-western North America, are infected naturally with relapsing-fever group spirochetes in Mendocino County, California. Relapsing-fever group borreliae were detected in four (1.7%) of 234 nymphal and two (0.7%) of 282 adult host-seeking I. pacificus ticks by polymerase chain reaction and sequence analysis of the 16S rRNA and flagellin genes, respectively, exhibiting 99 and 98.5% sequence homology to Borrelia miyamotoi Fukunaga. Phylogenetic analysis based on these two genes revealed that the borreliae detected in these ticks belong to the relapsing-fever group and that these are closely related to, if not identical with, B. miyamotoi.
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1 January 2006
Detection of a Borrelia miyamotoi Sensu Lato Relapsing-Fever Group Spirochete from Ixodes pacificus in California
Jeomhee Mun,
Rebecca J. Eisen,
Lars Eisen,
Robert S. Lane
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Journal of Medical Entomology
Vol. 43 • No. 1
January 2006
Vol. 43 • No. 1
January 2006
Borrelia miyamotoi
California
Ixodes pacificus
relapsing-fever group spirochetes