Query: NC_009879:860925 Rickettsia canadensis str. McKiel, complete genome Lineage: Rickettsia canadensis; Rickettsia; Rickettsiaceae; Rickettsiales; Proteobacteria; Bacteria General Information: This organism was originally isolated from ticks in a field study on tick-transmitted diseases of small mammals in Canada. Member of the typhus group of Rickettsiales. Members of this genus, like other Rickettsial organisms such as Neorickettsia and Anaplasma, are obligate intracellular pathogens. In both groups, the bacteria are transmitted via an insect, usually a tick, to a host organism where they target endothelial cells and sometimes macrophages. They attach via an adhesin, rickettsial outer membrane protein A, and are internalized where they persist as cytoplasmically free organisms. Rickettsia canadensis was originally thought to be a member of the typhus group of Rickettsiales, however, it is now thought to represent a distict group with the rickettsia.
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General Information: This strain (82-40) was isolated from the blood of a human patient who was having a renal transplant and is the best characterized isolate of this species.. The ratio of bloodstream infection to diarrheal illnesses for C. fetus is nearly 400-fold higher than for C. jejuni, indicating its marked propensity for invasive disease compared to C. jejuni. Causes infertility, infectious abortions in cattle, opportunistic human pathogen. This organism causes infertlity and infectious abortions in domesticated sheep, goats and cattle. It is an opportunistic pathogen in humans which can severely affect immunocompromised patients. Initially the bacterium can cause gastroenteritis, and then spread systemically throughout the blood (bacteremia) and cause septicemia, meningitis, and other systemic infections. This layer is essential for host colonization, and prevents complemented-mediated immune responses by inhibiting complement C3b binding.