Viral:
Distribution: unilateral or bilateral
Duration: 1-2 weeks
Discharge: watery / mucoid
Associated: viral prodrome
Bacterial:
Distribution: unilateral or bilateral
Duration: 1-2 weeks
Discharge: purulent
Associated: unremitting ocular discharge
Allergic:
Distribution: always bilateral
Duration: less than 30 minutes to perennial
Discharge: watery
Associated: ocular pruritus
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