Conjunctivitis is defined as redness of the conjunctivae associated with hyperemia and congestion of the blood vessels, with varying severity of ocular exudate. Preauricular adenopathy may be present.

Bacteria, viruses, chlamydia, rickettsiae, fungi, parasites, and numerous noninfectious agents and metabolic diseases may induce conjunctivitis. Early etiological diagnosis of acute bacterial conjunctivitis is of utmost importance because of the potential of rapid development that may cause irreversible ocular damage. Arriving at a specific diagnosis is important for the selection of appropriate therapy.

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