Rates of disease is related to the underlying cause which varies by the age 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.It is estimated that acute conjunctivitis affects 6 million people annually in the United States.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. History
An adenovirus was first isolated by Rowe et al. in 1953. Two years later, Jawetz et al. published on epidemic keratoconjunctivitis. : 437  "Madras eye" is a colloquial term that has been used in India for the disease. Society and culture
Conjunctivitis imposes economic and social burdens. The cost of treating bacterial conjunctivitis in the United States was estimated to be $377 million to $857 million per year. Approximately 1% of all primary care office visits in the United States are related to conjunctivitis. Approximately 70% of all people with acute conjunctivitis present to primary care and urgent care. See also
Conjunctival suffusion
Ophthalmia

References
External links

Conjunctivitis at Curlie
"Pink Eye". MedlinePlus. U.S. National Library of Medicine.
Swan neck deformity is a deformed position of the finger, in which the joint closest to the fingertip is permanently bent toward the palm while the nearest joint to the palm is bent away from it (DIP flexion with PIP hyperextension). It is commonly caused by injury, hypermobility or inflammatory conditions like rheumatoid arthritis or sometimes familial (congenital, like Ehlers–Danlos syndrome). Pathophysiology
Swan neck deformity has many of possible causes arising from the DIP, PIP, or even the MCP joints. In all cases, there is a stretching of the volar plate at the PIP joint to allow hyperextension, plus some damage to the attachment of the extensor tendon to the base of the distal phalanx that produces a hyperflexed mallet finger. Duck bill deformity is a similar condition affecting the thumb (which cannot have true swan neck deformity because it does not have enough joints). Diagnosis
Diagnosis of swan neck deformity is mainly clinical. MRI of the hand may suggest volar plate attenuation of PIP and extensor tendon damage for DIP  Genetic screening tests such as for CMT disease may also be indicated. Treatment
Splinting for fingers. Passive stretching and clearing the deformity. References
External links
Swan neck deformity at Wheeless Textbook of Orthopedics, a technical review of the condition
Rheumatoid arthritis: Image showing deformities