What classification is Rickettsia?
Classification. The genus Rickettsia encompasses a large group of obligate intracellular, Gram-negative bacteria that fall under the family Rickettsiaceae, order Rickettsiales, class Alphaproteobacteria, phylum Proteobacteria.
What are types of Rickettsia?
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.
Is Rickettsia bacteria or virus?
The rickettsia are bacteria which are obligate intracellular parasites. They are considered a separate group of bacteria because they have the common feature of being spread by arthropod vectors (lice, fleas, mites and ticks).
What are the characteristics of Rickettsia?
The rickettsiae are rod-shaped or variably spherical, nonfilterable bacteria, and most species are gram-negative. They are natural parasites of certain arthropods (notably lice, fleas, mites, and ticks) and can cause serious diseases—usually characterized by acute self-limiting fevers—in humans and other animals.
What are the three main groups of Rickettsia?
Classification. The classification of Rickettsia into three groups (spotted fever, typhus, and scrub typhus) was initially based on serology. This grouping has since been confirmed by DNA sequencing. All three of these groups include human pathogens.
Are Rickettsia spirochetes?
INTRACELLULAR BACTERIA: RICKETTSIAS AND SPIROCHETES These bacteria are the etiologic agents of Rocky Mountain spotted fever, ehrlichiosis, and scrub typhus, respectively, and may theoretically be transmitted by transfusion.
Is Rickettsia heterotrophic or autotrophic?
(1988), includes infectious agents, nitrogen-fixing symbionts, and pigmented autotrophic/heterotrophic taxa. The rickettsias are very small intracellular parasites of vertebrates, usually with a very complex lifecycle involving an invertebrate intermediate host.
Is Rickettsia a flagella?
The cells are extremely small (0.25 u in diameter) rod-shaped, coccoid and often pleomorphic microorganisms which have typical bacterial cell walls, no flagella (except for Rickettsia prowazekii), are gram-negative and multiply via binary fission only inside host cells. They occur singly, in pairs, or in strands.
Are Rickettsia bacteria?
Rickettsiae are bacterial obligate intracellular parasites ranging from harmless endosymbionts to the etiologic agents of some of the most devastating diseases known to mankind.
What are 3 diseases caused by Rickettsia?
Rickettsial Diseases (Including Spotted Fever & Typhus Fever Rickettsioses, Scrub Typhus, Anaplasmosis, and Ehrlichioses)