: The microbiologic evaluations of 332 consecutive patients with the primary diagnosis of chronic blepharitis were reviewed and compared to those of 160 control patients. The most commonly isolated organisms from lids with blepharitis were Staphylococcus epidermidis (95.8%), Propronibacterium acnes (92.8%), Corynebacterium sp. (76.8%), Acinetobacter sp. (11.4%), and Staphylococcus aureus (10.5%). Compared to controls, S. epidermidis (p < 0.01), P. acnes (p < 0.02), and Corynebacterium sp. (p < 0.001) were present significantly more often. S. aureus and the isolation of more than one microbial species were not more common in blepharitis patients. Quantitatively, heavy growth, by total and individual species, was significantly more common in blepharitis patients (total, p < 0.001; S. epidermidis, p < 0.001, P. acnes, p < 0.001). These data demonstrate that patients with blepharitis are more likely to have normal skin bacteria on their lids and in greater quantities than nonblepharitis patients.
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