Borrelia recurrentis

Borrelia Recurrentis (louse-borne relapsing fever (LBRF) is a classic epidemic disease. It has an incubation period of 4–18 (average 7) days. First clinical symptoms include abrupt fever that increases to nearly 40 °C in a few days, accompanied by rigors, mimicing malaria.
Exflagellating Plasmodium vivax microgametes can sometimes be mistaken for spirochaetes (‘pseudoborreliosis’).