Common causing agents are Staph aureus, Streptococcus pneumoniae, or
Haemophilus influenzae. People who wear contact lenses can be infected by
Pseudomonas aeruginosa
Presence of mucopurulent discharge and crusting can occur in the morning when the
discharge is dry
Usually leads to redness of unilateral eye but may have bilateral involvement if
spread occurs by rubbing both eyes
Should be treated with antibiotics (e.g. erythromycin ointment and/or polymyxin-
trimethoprim drops) for 5-7 days
Patients who wear contact lenses should not wear contact lenses for at least 7 days
If patient has bacterial conjunctivitis for 4 weeks, this is chronic in nature and should
be evaluated by an ophthalmologist