“…BACKGROUND: Current isolation techniques for spotted fever group Rickettsia from clinical samples are laborious and are limited to tissue, blood and blood derivatives with volumes ideally greater than 1 mL. …”
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“…Candidatus Midichloria mitochondrii and bacteria from the genus Rickettsia were mainly responsible for the overexpression of bacterial transcripts. …”
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“…In a broad sense, Rickettsiae are a group of microorganisms that can be transmitted mechanically or biologically to animals and humans. …”
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“…Based on model-predicted global distributions of the 17 major SFGR species, we found five spatial clusters aggregated by ecological similarity in terms of environmental and ecoclimatic features. Rickettsia felis is the leading SFGR species to which 4.4 billion (95% CI 3.8–5.3 billion) people are at risk, followed by Rickettsia conorii (3.7 billion) and Rickettsia africae (3.6 billion). …”
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“…Tick-borne rickettsioses are mainly caused by obligate intracellular bacteria belonging to the spotted fever group (SFG) of the Rickettsia genus. So far, the causative agents of SFG rickettsioses have not been detected in cattle ticks from Tunisia. …”
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“…Three emerging zoonotic pathogens were identified, Anaplasma phagocytophilum and two Rickettsia species (R. helvetica, R. monacensis) DNA, in the blood of tested animals. …”
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“…BACKGROUND AND AIM: Scrub typhus and murine typhus are globally distributed zoonoses caused by the intracellular Gram-negative bacteria Orientia tsutsugamushi and Rickettsia typhi, respectively. Numerous studies have been undertaken on rickettsial illnesses in humans and animals, including arthropod vectors, in Thailand. …”
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“…Treatment is available if identified, but testing for Rickettsiae is limited. Little is known about SFGR prevalence and distribution of Rickettsiae species in Kazakhstan. …”
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“…We sequenced the genome of Rickettsia felis, a flea-associated obligate intracellular α-proteobacterium causing spotted fever in humans. …”
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“…The recently sequenced Rickettsia felis genome revealed an unexpected plasmid carrying several genes usually associated with DNA transfer, suggesting that ancestral rickettsiae might have been endowed with a conjugation apparatus. …”
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“…The evidence offered in the first of these studies indicative of a causative relationship between Rickettsia ruminantium and heartwater is supplemented by the following observations concerning the ticks which carry the disease. …”
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“…At all events, the differentiation of the non-pathogenic Rickettsia-like organisms from Dermacentroxenus rickettsi is extremely difficult. …”
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“…Precise interpretation of our experiments seems to impose the following conclusions: Guinea pigs inoculated with washed Rickettsiae from Mexican typhus fever develop a disease identical with that resulting from inoculations with whole tunica scrapings, blood or other virulent material, and become thereby immunized to European typhus fever. …”
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“…The endothelial cells of capillaries and small vessels swell up, thus partially occluding the lumina. Rickettsia bodies are found in the swollen cells, in numbers which remind one of the intracellular Rickettsiae of the tunica in typhus infected guinea pigs. …”
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“…Heating the formalinized Rickettsia suspensions at 70°C. for 30 minutes renders them inactive in normal men and guinea pigs. …”
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“…An isolate shared 99.2%, 99.8%, 99.8%, 99.9%, and 100% homology with the 17 kDa, ompA, gltA, 16S rRNA, and Sca4 genes, respectively, of Rickettsia honei. This Australian rickettsiosis has similar symptoms to Flinders Island spotted fever, and the strain is genetically related to R. honei. …”
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“…In vitro, R. prowazekii rickettsiae infected and replicated in the murine adipocyte cell line 3T3-L1. …”
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“…“scattered” pattern whiteflies. During adulthood, Rickettsia increased in density in the “scattered” pattern whiteflies until it reached the “confined” pattern Rickettsia density on day 21. …”
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