Query: NC_009381:1414985 Yersinia pestis Pestoides F chromosome, complete genome Lineage: Yersinia pestis; Yersinia; Enterobacteriaceae; Enterobacteriales; Proteobacteria; Bacteria General Information: Atypical strain isolated from the former Soviet Union, USSR. This strain lacks a plasminogen activator and is virulent by the aerosol route. Specific virulence factors are encoded within pathogenicity islands (PAIs) that are required for the invasive phenotype associated with Yersinia infections. One key virulence plasmid contained by the three human-specific pathogens is pCD1/pYv, which encodes a type III secretion system for the delivery of virulence proteins that contribute to internalization into the host cell. It is the causative agent of plague (bubonic and pulmonary) a devastating disease which has killed millions worldwide. The organism can be transmitted from rats to humans through the bite of an infected flea or from human-to-human through the air during widespread infection. Yersinia pestis is an extremely pathogenic organism that requires very few numbers in order to cause disease, and is often lethal if left untreated. The organism is enteroinvasive, and can survive and propagate in macrophages prior to spreading systemically throughout the host. Yersinia pestis also contains a PAI on the chromosome that is similar to the SPI-2 PAI from Salmonella that allows intracellular survival in the organism.
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General Information: 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 causes a range of infections similar to those observed with Enterococcus faecalis, including urinary tract infections, bacteremia (bacteria in the blood), and infective endocarditis (inflammation of the membrane surrounding the heart). Hospital-acquired infections from this organism are on the rise due to the emergence of antiobiotic resistance strains and has led to the rise of vancomycin-resistant Staphylococcus aureus strains due to the horizontal transfer of Enterococcus antibiotic resistance genes. Little is known about the virulence mechanisms in this organism, but the genome does encode an esp gene for the surface adhesin. Vancomycin resistant isolates are more typically Enterococcus faecium than Enterococcus faecalis.