Regression fever

Relapsing fever is an acute infectious disease caused by a variety of recurrent fevers. Its clinical features are periodic high fever with systemic pain, hepatosplenomegaly and bleeding tendency, and severe jaundice. In severe cases, jaundice and bleeding may occur. Fever period and intermittent period appear alternately, cold and heat return, so it is called return to fever. According to the difference of the transmission medium, it is divided into two major categories: lice-borne regression fever (epidemic regression fever) and tick-borne regression fever (endemic regression fever).