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In page Conjunctivitis:

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Approximately 80% of cases of conjunctivitis in adults and less than 20% in children are due to viruses, with 65% to 90% of these cases being attributed to adenoviruses.[1][2] Viral conjunctivitis is often associated with an infection of the upper respiratory tract, a common cold, or a sore throat. Other associated signs may include pre-auricular lymph node swelling and contact with another person with a red eye.[2] Eye pain may be present if the cornea is also involved.[2] Its symptoms include excessive watering and itching. The discharge in viral conjunctivitis is usually (but not always) watery.[2] The infection usually begins in one eye but may spread easily to the other eye.[citation needed]