Clinical Significance Natural Habitat and Reservoir

S. aureus is widely distributed in the environment, although it may also be found as part of the normal bacterial flora of humans or other mammals. Strains may colonize various anatomic sites including the skin, mucous membranes, and the upper respiratory, gastrointestinal, and genitourinary tracts.[24] Nevertheless, S. aureus has a particular predilection for colonizing the anterior nares of humans.[15,24] A constellation of host factors is believed to play a role in the ability of an individual to asymptomatically carry this organism. It is estimated that 20% of humans are persistent S. aureus carriers, 60% are intermittent carriers, whereas the remaining 20% are noncarriers.[24] Carriage of MRSA has similar anatomic predilections but occurs less commonly, being more prominent in hospitalized patients and health-care work-ers.[15,24] Some patients who become colonized with MRSA eventually develop an MRSA infection. MRSA are easily spread from a colonized patient or health-care worker to other hospitalized individuals, usually via unwashed hands.[15,24] Airborne transmission may be important in the development of nasal carriage.[24]

Getting Started With Dumbbells

Getting Started With Dumbbells

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.

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