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Rickettsia typhi is a small, aerobic, obligate intracellular, rod shaped gram negative bacterium. [1] It belongs to the typhus group of the Rickettsia genus, along with R. prowazekii . [ 2 ] R. typhi has an uncertain history, as it may have long gone shadowed by epidemic typhus ( R. prowazekii ). [ 3 ]
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 ...
Rocky Mountain spotted fever - caused by Rickettsia rickettsii, this disease is transmitted by tick bites and is prevalent in the Americas. Scrub typhus - caused by Orientia tsutsugamushi (formerly classified as a Rickettsia), this disease is transmitted by chigger bites and is common in parts of Asia and the Pacific.
The name comes from the Greek tûphos (τῦφος), meaning 'hazy' or 'smoky' and commonly used as a word for delusion, describing the state of mind of those infected. [7] While typhoid means 'typhus-like', typhus and typhoid fever are distinct diseases caused by different types of bacteria, the latter by specific strains of Salmonella typhi. [8]
Rickettsia typhi: Murine typhus (Endemic typhus) Early diagnosis continued to be based on clinical suspicion. The most effective antibiotics include tetracycline and chloramphenicol. No Mycoplasma pneumoniae: Mycoplasma pneumonia: Chest X-Ray, Chest CT, blood test Erythromycin, doxycycline: No Mycoplasma genitalium: Mycoplasma genitalium infection
Main article: Human parasite Endoparasites Protozoan organisms Common name of organism or disease Latin name (sorted) Body parts affected Diagnostic specimen Prevalence Source/Transmission (Reservoir/Vector) Granulomatous amoebic encephalitis and Acanthamoeba keratitis (eye infection) Acanthamoeba spp. eye, brain, skin culture worldwide contact lenses cleaned with contaminated tap water ...
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 .
Rickettsia rickettsii is a Gram-negative, intracellular, cocco-bacillus bacterium that was first discovered in 1902. [1] Having a reduced genome, the bacterium harvests nutrients from its host cell to carry out respiration, making it an organo-heterotroph.