Editing Conjunctivitis (section)

=== Viral ===
[[File:Conjunctivitis disease.jpg|thumb|Viral conjunctivitis]]
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.<ref name="Az2013"/><ref name="Durand 2023" />
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 [[Preauricular deep parotid lymph nodes|pre-auricular]] lymph node swelling and contact with another person with a red eye.<ref name="Durand 2023" /> Eye pain may be present if the cornea is also involved.<ref name="Durand 2023" /> Its symptoms include excessive watering and itching. The discharge in viral conjunctivitis is usually (but not always) watery in nature.<ref name="Durand 2023" /> The infection usually begins in one eye but may spread easily to the other eye.{{citation needed|date=February 2023}}

Viral conjunctivitis manifests as a fine, diffuse pinkness of the conjunctiva which may be mistaken for [[iritis]], but corroborative signs on [[microscopy]], particularly numerous [[Lymph follicle|lymphoid follicle]]s on the [[Tarsus (eyelids)|tarsal]] conjunctiva, and sometimes a [[punctate keratitis]] are seen.{{citation needed|date=February 2023}}