| one of a group of fevers characterized by relapses, occurring in many tropical countries, and caused by several species of spirochetes transmitted by several species of lice and ticks. |
| re·laps·ing fever (rĭ-lāp'sĭng) n. Any of several infectious diseases characterized by chills and fever and caused by spirochetes transmitted by lice and ticks. Also called recurrent fever. |
relapsing fever n.
An acute infectious disease caused by a strain of Borrelia transmitted by lice or ticks and marked by recurring febrile attacks lasting about six days and separated from one other by apyretic intervals of about the same length. Also called recurrent fever.