Rickettsiales


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Related to Rickettsiales: Rickettsiaceae, Wolbachia

Rickettsiales

 [rĭ-ket″se-a´lez]
an order of bacteria comprising small, gram-negative, rod-shaped or coccoid, often pleomorphic microorganisms occurring as elementary bodies that typically multiply only inside the cells of the host. Found as parasites in both vertebrates and invertebrates, which may serve as vectors, they may be pathogenic for both humans and other animals.

Rickettsiales

/Rick·ett·si·a·les/ (rĭ-ket″se-a´lēz) an order of gram-negative bacteria occurring as elementary bodies that typically multiply only inside cells of the host. Parasitic for vertebrates and invertebrates, which serve as vectors, they may be pathogenic for humans and other animals.

Rickettsiales

an order of bacteria containing the families Rickettsiaceae and Anaplasmataceae. Small, obligately intracellular, gram-negative coccobacillary bacteria parasitizing host cells as a source of ATP. They are found in wild mammals, ticks, lice and trematodes and are transmitted by bites of arachnid or insect bites or by ingestion of trematodes. Generally replicate within erythrocytes, leukocytes or endothelial cells.
References in periodicals archive ?
Similarly, orders of a-proteobacteria differed in the two samples, with Rickettsiales and Rhodobacterales dominating in NS-L while Rhodobacterales was most abundant in MV-L.
The genus Rickettsia includes bacteria of the order rickettsiales in the alpha subdivision of the class Proteobacteria.
This work was supported by the Programa Iberoamericano de Ciencias y Tecnologia para el Desarrollo (CYTED) to Red Iberoamericana para la Investigacion y Control de las Enfermedades Rickettsiales (RIICER).
En la region Neotropical, el genero Amblyomma ha tomado recientemente mayor relevancia [9], dado que algunas especies han sido incriminadas de ser vectores de microorganismos rickettsiales patogenos para humanos.
Diseases caused by Mycoplasmatales, Rickettsiales and Spirochaetales.
Half of these emerging infection events involved bacteria belonging, for the most part, to the proteobacterial order Rickettsiales (1).
Over the past 20 years, advances in molecular techniques and cell culture have facilitated identification of Rickettsiales, and new species and diseases have been described (4,8).
The taxonomy of Rickettsiales is complex and continues to be updated, but currently the agents of rickettsial diseases are classified as belonging to 4 distinct genera: Rickettsia (including 2 biogroups: spotted fever group [SFG] rickettsiae with >10 species and typhus group [TG] rickettsiae with 2 species), Orientia (Orientia tsutsugamushi, the agent of scrub typhus), Ehrlichia (Ehrlichia chaffeensis, the agent of human monocytic ehrlichiosis), and Anaplasma (Anaplasma phagocytophilium, the agent of human granulocytic anaplasmosis).
Tick-borne rickettsioses are infections caused by obligate intracellular gram-negative bacteria of the spotted fever group (SFG) in the genus Rickettsia and the order Rickettsiales.
The pathogen, a rickettsiale, has only recently been confirmed (Friedman 2000) but the factors prompting the emergence of the disease are unknown; its severity, however, is enhanced by increased water temperature (Moore et al.