Factors Affecting Staphylococcal Colonization Among NIDDM Outpatients

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Abstract
Because colonization with Staphylococcus aureus probably predisposes to staphylococcal infections, we examined several factors that may be associated with staphylococcal carriage in outpatients with non-insulin-dependent diabetes mellitus and in nondiabetic controls. Nose and skin carrier rates for 59 diabetic patients were significantly greater (30.5%) than for 44 controls (11.4%) (P = .02), but rates did not differ significantly between diabetic patients who injected insulin (31.0%) and those who did not (30.0%). Among the diabetic patients, staphylococcal colonization was not significantly correlated (P > .05) with recent antibiotic treatment, age, race, or clinical duration of diabetes but was inversely correlated (P < .03) with glycemic control, as measured by fasting plasma glucose and glycosylated hemoglobin levels. Hospitalization in the previous year was also associated with staphylococcal colonization, and it was significantly more common among the diabetic patients than the controls; however, this did not account for the increased colonization rates observed. Our results in a well-characterized population confirm an increased rate of staphylococcal colonization among diabetic as compared with nondiabetic outpatients but demonstrate that neither injections of insulin nor various pertinent demographic factors explain this finding.

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