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Hematogenous dissemination of bacteria is part of the pathophysiology of meningitis and endocarditis, and of Pott's disease and many other forms of osteomyelitis. In the hospital, indwelling catheters are a frequent cause of bacteremia and the subsequent nosocomial infections, because they provide a means by which bacteria normally found on the skin can enter the bloodstream. Other causes of bacteremia include dental procedures, urinary tract infections, IV drug use, and colorectal cancer. Bacteremia is operationally defined as the presence of viable bacteria as evidenced by positive blood cultures. Dental work is most commomly associated with bacteremia. Also seen in oropharyngeal, gastrointestinal or genitourinary surgery or exploration. Simple activities like eating and brushing can also lead to mild transient bacteremia. In those people in whom TB bacilli overcome the immune system defenses and begin to multiply, there is progression from TB infection to TB disease. This may occur soon after infection (primary TB disease – 1 to 5 percent) or many years after infection (post primary TB, secondary TB, reactivation TB disease of dormant bacilli – 5 to 9 percent). About five percent of infected persons will develop TB disease in the first two years, and another five percent will develop disease later in life. In all, about 10 percent of infected persons with normal immune systems will develop TB disease in their lifetime. Some medical conditions increase the risk of progression to TB disease. In HIV infected persons with TB infection, the risk increases to 10 percent each year instead of 10 percent over a lifetime. Click on following items to see more information: Acinetobacter, Antibacterial, Antibiotic, Antibiotic, Antibacterial, Bacilli, Bacterium, Bacterium, Antibacterial, Phages, Biofilm, Campylobacter, Cell culture, Ciprofloxacin, Corynebacteria, E. coli, E. coli, E. coli, E. coli, E. coli, E. coli, Erythromycin, Functional genomics, Yeast, Growth medium, Kluyveromyces, Meningococci, Bacterial, Microflora, Multidrug resistance, Pathogenic bacteria, Prokaryote, P. aeruginosa, Saccharomyces cerevisiae, Saccharomyces cerevisiae, Salmonella, Salmonella, Staphylococci, Staphylococci, Streptococcus, Streptococcus, Vibrio The causal pathogen is Erwinia amylovora, a Gram-negative bacterium in the family Enterobacteriaceae. Pears are the most susceptible, but apples, crabapples, quinces, hawthorn, cotoneaster, pyracantha, raspberry and some other rosaceous plants are also vulnerable. The disease is believed to be indigenous to North America, from where it spread to most of the rest of the world. Fire blight is not believed to be present in Australia. Fire blight is a systemic disease. The term 'fire blight' describes the appearance of the disease, which can make affected areas appear blackened, shrunken and cracked, as though scorched by fire. Primary infections are established in open blossoms and tender new shoots and leaves in the spring when blossoms are open. Honeybees and other insects, birds, rain and wind can transmit the bacterium to susceptible tissue. Injured tissue is also highly susceptible to infection, including punctures and tears caused by plant-sucking or biting insects. The myxobacteria are a group of bacteria that predominantly live in the soil. The myxobacteria have very large genomes, relative to other bacteria, e.g. 9-10 million nucleotides. Polyangium cellulosum has the largest known (as of 2003) bacterial genome, at 12.2 million nucleotides. Myxobacteria are included among the proteobacteria, a large group of Gram-negative forms.
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