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Increased risk of common infections in patients with type 1 and type 2 diabetes mellitus.

BACKGROUND
Clinical data on the association of diabetes mellitus with common infections are virtually lacking, not conclusive, and often biased. We intended to determine the relative risks of common infections in patients with type 1 and type 2 diabetes mellitus (DM1 and DM2, respectively).


METHODS
In a 12-month prospective cohort study conducted as part of the Second Dutch National Survey of General Practice, we compared 705 adult patients who had DM1 and 6712 adult patients who had DM2 with 18,911 control patients who had hypertension without diabetes. Outcome measures were medically attended episodes of infection of the respiratory tract, urinary tract, and skin and mucous membranes. We applied multivariable and polytomous logistic regression analysis to determine independent risks of infections and their recurrences in patients with diabetes, compared with control patients.


RESULTS
Upper respiratory infections were equally common among patients with diabetes and control patients. Patients with diabetes had a greater risk of lower respiratory tract infection (for patients with DM1: adjusted odds ratio [AOR], 1.42 [95% confidence interval {CI}, 0.96-2.08]; for patients with DM2: AOR, 1.32 [95% CI, 1.13-1.53]), urinary tract infection (for patients with DM1: AOR, 1.96 [95% CI, 1.49-2.58]; for patients with DM2: AOR, 1.24 [95% CI, 1.10-1.39]), bacterial skin and mucous membrane infection (for patients with DM1: AOR, 1.59 [95% CI, 1.12-2.24]; for patients with DM2: AOR, 1.33 [95% CI, 1.15-1.54]), and mycotic skin and mucous membrane infection (for patients with DM1: AOR, 1.34 [95% CI, 0.97-1.84]; for patients with DM2: AOR, 1.44 [95% CI, 1.27-1.63]). Risks increased with recurrences of common infections.


CONCLUSIONS
Patients with DM1 and DM2 are at increased risk for lower respiratory tract infection, urinary tract infection, and skin and mucous membrane infection. Studies are warranted into management of such infections in patients with diabetes.