User:Burt Macklan/sandbox

Epidemiology
The prevalence of conjunctivitis is related to the underlying cause which can be influenced by the age of the patient as well as the time of year. Acute conjunctivitis is most frequently found in infants, school-age children and the elderly. The most common cause of infectious conjunctivitis is viral conjunctivitis. The most common etiological agent for viral conjunctivitis is human adenovirus (HAdV). Infection by human adenovirus accounts for 65% to 90% of cases of viral conjunctivitis. The most frequent cause of conjunctivitis is allergic conjunctivitis and it affects 15% to 40% of the population. Allergic conjunctivitis accounts for 15% of eye related primary care consultations - most including seasonal or perpetual conditions.

Some seasonal trends have been observed for the occurrence of different forms of conjunctivitis. The occurrence of bacterial conjunctivitis peaks from December to April, viral conjunctivitis peaks in the summer months and allergic conjunctivitis is more prevalent throughout the spring and summer.