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The "emergence" of this disease led to detailed ecologic studies of vector ticks in the genus Ixodes, which transmit the pathogen Borrelia burgdosferi from white-footed mice to humans.
The genus Ixodes, family Ixodidae, contains >200 species, of which 14 make up the I.
The genus Ixodes in the United States: a scanning electron microscope study and key to the adults.
Two groups of spirochetes stand out among these tick-borne species because of their prevalence as human pathogens: Lyme disease spirochetes, transmitted by the relatively slow-feeding ixodid (hard) ticks of the genus Ixodes, and relapsing fever spirochetes, transmitted by the fast-feeding argasid (soft) ticks of the genus Ornithodoros (Figure 1).