Who is most at risk for conjunctivitis?

Children. Viral conjunctivitis is spread by contact, not through the air like a common cold. Hands touching the infected eye, for instance, may open a door, leaving the virus on the knob for the next guy to get it on his hands. Children spread this condition readily because they are frequently in physical contact in playing. They lack the social barriers that adults have.
Coming in contact. Conjunctivitis spreads via secretions from body fluids of the infected person so proper hand washing techniques will reduce this spread.