Legionella - pathogenic Gram negative bacterium. Acquired its name after a July, 1976 outbreak of a then-unknown "mystery disease" sickened 221 persons, causing 34 deaths. The outbreak was first noticed among people attending a convention of the American Legion - an association of U.S. military veterans
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"Listeria" is a bacterial genus that contains 7 species. Named after the English pioneer of sterile surgery Joseph Lister, genus received its current name in 1940. Listeria species are Gram-positive bacilli. The major human pathogen in the Listeria genus is "L. monocytogenes." Causative agent of relatively rare bacterial disease, listeriosis, a serious infection caused by eating food contaminated with bacteria. Disease affects primarily pregnant women, newborns, adults with weakened immunity."
Clostridium difficile: Emerging Issues and Treatments. Clostridium difficile infection is an important cause of intestinal disease, primarily affecting hospitalized patients exposed to antibiotics. Infection has been associated with prolonged hospital stays and excess healthcare expenditures. Recent changes in epidemiology of this disease show a rise in community-acquired cases in people outside the hospital settings without traditional risk factors.