Diabetes mellitus is one of the most frequent metabolic distortions pr
edisposing for infectious diseases. Characteristic features of patient
s with diabetes mellitus are dysfunctions of professional phagocytes,
in particular of polymorphonuclear leucocytes. Infections of skin and
soft tissue in particular of the lower extremities, rhinocerebral muco
rmycosis, invasive external otitis and urinary tract infections are ty
pically associated with diabetes mellitus. Frequently, a rapidly progr
essive infection requires urgent surgical intervention and parenteral
antimicrobial therapy. Short-interval metabolic controls, improvement
of metabolic functions, extended vaccination and strict hygiene measur
es are supportive to prevent infections or to reduce a complicated out
come of infections.