Case report: A retrospective serological analysis indicating human exposure to tick-borne relapsing fever spirochetes in Texas.

1 Department of Pediatrics, Section of Tropical Medicine, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, United States of America, 2 Texas State Guard, Medical Brigade, Uvalde, Texas, United States of America, 3 Department of Biological Sciences, Mississippi State University, Starkville, Mississippi, United States of America, 4 Department of Chemistry, Mississippi State University, Starkville, Mississippi, United States of America