Query: NC_009505:264963 Brucella ovis ATCC 25840 chromosome I, complete sequence Lineage: Brucella ovis; Brucella; Brucellaceae; Rhizobiales; Proteobacteria; Bacteria General Information: This strain was isolated from sheep tissue in Australia. Causes brucellosis in sheep. This organism specifically affects sheep, causing ovine brucellosis which results in significant economic losses. Infection by the organism can cause infertility in rams as the bacterium preferentially colonizes the genital tract, and causes inflammation of the epididymis which leads to necrotic lesions and a decrease in sperm numbers and motility. This bacterium, like other Brucella, is an intracellular pathogen that infects phagocytic cells such as macrophages. Bacterial cells produces a lipopolysaccharide that lacks O-antigen side chains, which results in a rough colony phenotype, and aids in differentiation as compared to other Brucella.
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General Information: Causative agent of plague. 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 consists of three biotypes or serovars, Antiqua, Mediavalis, and Orientalis, that are associated with three major pandemics throughout human history. pMT1 encodes a protein, murine toxin, that aids rat-to-human transmission by enhancing survival of the organism in the flea midgut. 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.