Infectious conjunctivitis is one of the most common causes of red eye. Infectious conjunctivitis is commonly caused by bacterial or viral infection. The clinical term "red eye" is applied to a variety of infectious or inflammatory diseases of the eye. Conjunctivitis is most frequently caused by a bacterial or viral infection. Sexually transmitted diseases such as chlamydial infection and gonorrhea are less common causes of conjunctivitis. Ocular allergy is a major cause of chronic conjunctivitis.
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