Parasitic infections are one of the most common causes of persistent fever in adults.
Prolonged fever caused by parasites causes the patient to have sudden high fevers, lasting in episodes. Malaria or intestinal-related diseases is a common disease with prolonged fever caused by parasitic infections, in which fever caused by intestinal disease causes the patient to show signs of chills and prolonged chills.
https://www.vinmec.com/en/news/health-news/general-health-check/prolonged-fever-due-to-parasites/