There are several synonyms for the term "murine typhus". Some of these include endemic typhus, flea-borne typhus, and sylvatic typhus. All of these terms refer to a bacterial infection caused by Rickettsia typhi, which is transmitted to humans through the bite of infected fleas. Symptoms of the infection can include fever, headache, muscle pain, nausea, and rash. Treatment usually involves the use of antibiotics to help fight the infection. While murine typhus is not usually fatal, it is important to seek medical attention if you suspect that you may have been exposed to infected fleas or have become infected with the bacteria.