Cart is empty During 2012 to 2021, 251 cases of soft tick relapsing fever (STRF), caused by certain Borrelia spirochetes and transmitted to humans by soft-bodied Ornithodoros ticks, were reported in 11 states, according to research published in the July 21 issue of the U.S. Centers for Disease Control and Prevention Morbidity and Mortality Weekly Report.
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