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What is Murine typhus and explain in detail?
Murine typhus, also known as endemic typhus or flea-borne typhus, is a form of typhus transmitted by fleas (Xenopsylla cheopis), usually on rats, in contrast to epidemic typhus which is usually transmitted by lice. Murine typhus is an under-recognized entity, as it is often confused with viral illnesses. Most people who are infected do not realize that they have been bitten by fleas. Historically the term "hunger-typhus" was used  in accounts by British POWs in Germany at the end of World War I when they described conditions in Germany.

Signs and symptoms
Symptoms of endemic typhus include headache, fever, muscle pain, joint pain, nausea and vomiting. 40–50% of patients will develop a discrete rash six days after the onset of signs. Up to 45% will develop neurological signs such as confusion, stupor, seizures or imbalance.
Symptoms may resemble those of measles, rubella, or possibly Rocky Mountain spotted fever. These symptoms are likely caused by a vasculitis caused by the rickettsia.

Causes
It is caused by the bacterium Rickettsia typhi, and is transmitted by the fleas that infest rats.  While rat fleas are the most common vectors, cat fleas and mouse fleas are less common modes of transmission. These fleas are not affected by the infection. Human infection occurs because of flea-fecal contamination of the bites on human skin. Rats, cats, and opossums maintain the rickettsia colonization by providing it with a host for its entire life cycle. Rats can develop the infection, and help spread the infection to other fleas that bite them, and help multiply the number of infected fleas that can then infect humans.
Less often, endemic typhus is caused by Rickettsia felis and transmitted by fleas carried by cats or opossums.
In the United States of America, murine typhus is found most commonly in southern California, Texas and Hawaii