Query: NC_006570:1526071 Francisella tularensis subsp. tularensis Schu 4, complete genome Lineage: Francisella tularensis; Francisella; Francisellaceae; Thiotrichales; Proteobacteria; Bacteria General Information: This subspecies is virulent in humans, and the strain is a clinical isolate that is also virulent in an animal model. Originally isolated from a human case of tularemia in 1951. There are a large number of insertion sequences including a mariner element, which is a transposon typically found in eukaryotes and is the first instance of this element to be found in a microbe, which may have acquired it during transit through one of the insect vectors. Causative agent of tularemia. This organism was first identified by Edward Francis as the causative agent of a plague-like illness that affected squirrels in Tulare county in California in the early part of the 20th century. The organism now bears his name. The disease, which has been noted throughout recorded history, can be transmitted to humans by infected ticks or deerflies, infected meat, or by aerosol, and thus is a potential bioterrorism agent. This organism has a high infectivity rate, and can invade phagocytic and nonphagocytic cells, multiplying rapidly. Once within a macrophage, the organism can escape the phagosome and live in the cytosol. It is an aquatic organism, and can be found living inside protozoans, similar to what is observed with Legionella.
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General Information: This strain is one of the first vancomycin-resistant strains isolated. This isolate came from a blood culture derived from a chronically-infected patient in 1987 from Barnes Hospital in St. Louis, Missouri, USA. This strain was found to lack the cytolysin gene and a surface adhesin, Esp, that contributes to urinary tract infections. Mobile genetic elements make up one quarter of the genome. This genera consists of organisms typically found in the intestines of mammals, although through fecal contamination they can appear in sewage, soil, and water. They cause a number of infections that are becoming increasingly a problem due to the number of antibiotic resistance mechanisms these organisms have picked up. Both Enterococcus faecalis and Enterococcus faecium cause similar diseases in humans, and are mainly distinguished by their metabolic capabilities. This opportunistic pathogen can cause urinary tract infections, bacteremia (bacteria in the blood), and infective endocarditis (inflammation of the membrane surrounding the heart), similar to infections caused by Enterococcus faecium. Hospital-acquired infections from this organism are on the rise due to the emergence of antiobiotic resistance strains. Enterococcus faecalis produces a cytolysin toxin that is encoded on various mobile genetic elements, pathogenicity islands, and conjugative plasmids. The cytolysin aids in pathogenesis, possibly by causing destruction of cells such as erythrocytes, which allows access to new nutrients for the organism.