Rickettsia - Wikipedia
Rickettsia is a genus of nonmotile, gram-negative, nonspore-forming, highly pleomorphic bacteria that may occur in the forms of cocci (0.1 μm in diameter), bacilli (1–4 μm long), or threads (up to about 10 μm long).
What Are Rickettsial Diseases? - WebMD
2024年9月21日 · Of the 800 species of ticks in the world, less than 60 species transmit bacteria when they bite. One group of bacteria ticks carry is called rickettsiae. That’s why these tick-borne conditions...
Rickettsial Diseases | CDC Yellow Book 2024 - Centers for Disease ...
Rickettsial infections are caused by various bacteria within 6 genera of the order Rickettsiales: Rickettsia, Orientia, Anaplasma, Ehrlichia, Neoehrlichia, and Neorickettsia (Table 5-04).
Rickettsial Infection - StatPearls - NCBI Bookshelf
2023年7月17日 · Rickettsia is a group of vector-borne organisms that cause acute febrile illnesses throughout the world. While the clinical presentation of rickettsial infection is similar, the causative species and epidemiology can vary depending on the region.
Rickettsia | Definition, Genera, Characteristics, & Diseases
Rickettsia, family of bacteria, made up of two genera, Rickettsia and Orientia. The term rickettsia is sometimes also used to refer to organisms of the order Rickettsiales. Learn more about rickettsia and rickettsial diseases in humans and other animals.
Overview of Rickettsial Infections - The Merck Manuals
Rickettsial infections and related infections (such as anaplasmosis, ehrlichiosis, and Q fever) are caused by an unusual type of bacteria that can live only inside the cells of another organism. Most of these infections are spread through ticks, mites, fleas, or lice.
Rickettsiae - Medical Microbiology - NCBI Bookshelf
The rickettsiae are a diverse collection of obligately intracellular Gram-negative bacteria found in ticks, lice, fleas, mites, chiggers, and mammals. They include the genera Rickettsiae, Ehrlichia, Orientia, and Coxiella. These zoonotic pathogens cause …
Rickettsia - an overview | ScienceDirect Topics
Rickettsia are obligate intracellular pathogens that are taken up by macrophages and replicate in endothelial tissues, causing vasculitis. They are generally zoonoses with mammalian reservoirs and an arthropod vector, the bite from which may leave an eschar.
The Rickettsioses: A Practical Update - PMC
Rickettsia are small, obligately intracellular Gram negative bacilli. They are distributed among a variety of hematophagous arthropod vectors and cause illness throughout the world. Rickettsioses present as an acute undifferentiated febrile illness ...
Rocky Mountain Spotted Fever (Rickettsia rickettsii)
2023年7月17日 · Rocky Mountain spotted fever (RMSF) is an acute febrile tick-borne illness caused by Rickettsia rickettsii. In North America, it is both the most severe and the most common rickettsial infection. Without prompt antibiotic treatment, mortality rates are as high as 20 to …