Typhus: Understanding Symptoms, Causes, and Types

Typhus is a group of acute febrile illnesses caused by obligate intracellular bacteria of the genus Rickettsia, transmitted by arthropod vectors.

Main Types

Type	Agent	Vector	Typical Setting
Epidemic typhus	R. prowazekii	Body louse	Crowded, unsanitary conditions; war, disaster
Endemic (murine) typhus	R. typhi	Flea (rat)	Urban/rural; rodent exposure
Scrub typhus	Orientia tsutsugamushi	Chigger (mite larva)	Southeast Asia, Pacific; scrub vegetation
Spotted fever group	Various Rickettsia	Tick	Worldwide; e.g., Rocky Mountain spotted fever

Clinical Presentation

• High fever, chills, severe headache, myalgia, arthralgia
• Rash (often maculopapular, appears day 4–5; may be petechial)
• Confusion, nausea/vomiting

Diagnosis & Treatment

• Serology (IFA, ELISA), PCR, immunohistochemistry
• Doxycycline (first-line for all ages); alternatives: chloramphenicol, azithromycin
• Early treatment reduces mortality dramatically

Prevention

• Vector control (lice, fleas, ticks, mites)
• Personal protection (repellents, permethrin-treated clothing)
• Vaccines: limited availability (historical for epidemic typhus; none widely licensed currently)