Brucellae are aerobic, gram-negative, nonmotile, facultative intracellular, non-spore-forming coccobacilli. The genus Brucella belongs to the a-2 subgroup of the class Proteobacteria and is composed of six currently recognized nomen species: Brucella abortus, Brucella canis, Brucella melitensis, Brucella neotomae, Brucella ovis, and Brucella suis. Several other strains have been isolated from marine mammals and have been grouped generically as Brucella maris.
Among the various nomen species, B. abortus, B. melitensis, and B. suis have been reported to cause human brucellosis, also called Malta fever, a chronic febrile illness characterized by undulating fever, arthritic pains, and some neurological disorders. Currently, there is no acceptable human vaccine, and treatment is via prolonged antibiotic therapy that usually lasts for a year. Human infection occurs by direct contact with tissues and fluids from infected animals, consumption of contaminated dairy products, and inhalation. Brucellosis is also a major zoonotic disease that causes abortion and sterility in wild and domesticated animals. The World Health Organization considers B. melitensis as the most important zoonotic agent because it is extremely infectious, partly because of its aerosolic nature. Because of its ability to cause a debilitating disease in humans, it is considered a potent biological warfare agent. It can also bring havoc to the economy when used as a weapon for agroterrorism.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.