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Rickettsia typhi is a causative agent of murine typhus (endemic typhus) in humans and is distributed worldwide. [26] It is an acute, febrile illness that is mainly transmitted by the fleas of rodents, commonly associated with cities and ports where urban rats ( Rattus rattus and Rattus norvegicus ) are abundant. [ 26 ]
Properly, Rickettsia is the name of a single genus, but the informal term "rickettsia", plural "rickettsias," usually not capitalised, commonly applies to any members of the order Rickettsiales. Being obligate intracellular bacteria , rickettsias depend on entry, growth, and replication within the cytoplasm of living eukaryotic host cells ...
However, scrub typhus is still considered a rickettsiosis, even though the causative organism has been reclassified from Rickettsia tsutsugamushi to Orientia tsutsugamushi. [ citation needed ] Examples of rickettsioses include typhus , both endemic and epidemic, Rocky Mountain spotted fever , and Rickettsialpox .
Murine typhus, a rare infection (20-100 cases a year in the U.S.) caused by the bacterium Rickettsia typhi and transmitted by the feces of cat or rat fleas coming in contact with a break in the ...
Rickettsia prowazekii: Body louse: When the term "typhus" is used without qualification, this is usually the condition described. Historical references to "typhus" are now generally considered to be this condition. [citation needed] Murine typhus or "endemic typhus" Rickettsia typhi: Fleas on rats: Scrub typhus: Orientia tsutsugamushi
Rickettsialpox - caused by Rickettsia akari, this disease is transmitted by mite bites and is generally milder than other rickettsial infections. Rocky Mountain spotted fever - caused by Rickettsia rickettsii, this disease is transmitted by tick bites and is prevalent in the Americas.
The genus Rickettsia is the most prominent genus within the family. The bacteria that eventually formed the mitochondrion (an organelle in eukaryotic cells) is believed to have originated from this family. Most human pathogens in this family are in genus Rickettsia.
A spotted fever is a type of tick-borne disease which presents on the skin. [1] They are all caused by bacteria of the genus Rickettsia. Typhus is a group of similar diseases also caused by Rickettsia bacteria, but spotted fevers and typhus are different clinical entities.