Viral conjunctivitis is caused by several viruses and is characterized by inflammation of the conjunctiva. The most common type is adenovirus conjunctivitis. Clinical presentations include acute serous conjunctivitis, which involves minimal congestion and watery discharge; acute hemorrhagic conjunctivitis, seen with adenovirus and involving multiple conjunctival hemorrhages; and acute follicular conjunctivitis, associated with marked follicular hyperplasia. Epidemic keratoconjunctivitis is caused most commonly by adenovirus types 8, 19, and 37 and involves stages of acute serous conjunctivitis, follicular conjunctivitis, and pseudomemb