Murine typhus (endemic typhus): causes, symptoms, diagnosis, and prevention

Symptoms and clinical course

After an incubation period of several days to two weeks, typical symptoms begin suddenly and may include:

• Fever and chills (often high).
• Headache and sensitivity to light.
• Muscle aches and generalized weakness.
• Nausea, vomiting, and abdominal discomfort.
• Occasional cough or respiratory symptoms.

Rashes occur in some patients but are less consistent than in other rickettsial infections. Symptoms can resemble viral illnesses, so clinicians often consider viral and other bacterial causes when evaluating a patient.

Transmission and reservoirs

Murine typhus is flea-borne. Fleas become infected after feeding on rodents or other small mammals that carry the bacterium; humans typically become infected when infectious flea feces contaminate the bite site or are rubbed into the eyes or broken skin. Common flea species and rodent reservoirs are discussed in field guides and public health resources. For more on environmental risk factors see prevention resources.

Diagnosis, treatment, and prognosis

Diagnosis is usually clinical, supported by laboratory testing such as serology or molecular methods when available. The preferred treatment is a short course of doxycycline; most patients improve rapidly with appropriate antibiotics. Untreated cases can lead to complications, especially in vulnerable populations, but full recovery is common.

Prevention, history and notable distinctions

Prevention focuses on controlling rodent populations, reducing flea exposures, using insect repellents and flea control for pets, and improving sanitation. Public health descriptions and prevention guidance can be consulted for local measures. Historically called murine typhus because of its association with mice and rats, it is distinct from epidemic typhus (caused by Rickettsia prowazekii), which is spread by human lice and has different epidemiology and severity.

For further reading and regional guidance, see resources linked here: overview, clinical signs, and public health.