A relapsing fever that is characterized by relapsing or recurring episodes of fever, has_material basis_in Borrelia hermsii, has_material basis_in Borrelia parkeri or has_material basis_in Borrelia duttoni, which are transmitted_by soft ticks (Ornithodoros parkeri and Ornithodoros hermsii). The infection has_symptom tachypnea, has_symptom tachycardia, has_symptom hepatosplenomegaly and has_symptom lymphadenopathy.