Symptoms include an irritated red eye with a watery or purulent discharge.
Allergic conjunctivitis is usually bilateral with watery discharge and itching.
Treatment for allergic conjunctivitis includes topical mast cell stabilizers and antihistamines; bacterial conjunctivitis treatment includes topical antibiotics; viral conjunctivitis requires symptomatic treatment.
Bacterial and viral conjunctivitis is highly contagious; measures to prevent spread of infection should be considered.
Conjunctivitis is the inflammation of the lining of the eyelids and eyeball caused by bacteria, viruses, allergic or immunologic reactions, mechanical irritation, or medications. 
Manatee Sarasota Eye Clinic & Laser Center
RS serves as a consultant for Quidel, the manufacturer of the QuickVue Adeonvirus test, an advisory board member for Allergan, the manufacturer of gatifloxacin, and NovaBay Pharmaceuticals, Inc, the manufacturer of aganocides.
Dr Robert Sambursky would like to gratefully acknowledge Dr Lee Raykovicz, a previous contributor to this topic.
Cornea, External Disease & Refractive Surgery
Long Island College Hospital Eye Center
Assistant Professor of Ophthalmology
SUNY Downstate Medical Center
ME declares that he has no competing interests.
Sunderland Eye Infirmary
SF declares that he has no competing interests.
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