Conjunctival cryptosporidiosis in a duck.

Cryptosporidial conjunctivitis was detected histologically in one of 17 eight-week-old ducks during an investigation into the cause of conjunctivitis. Another 80 ducks were examined histologically for cryptosporidial conjunctivitis over the next few months. No further cases were detected. Because only one infected bird was detected, it was concluded that the cryptosporidial infection was an incidental finding rather than a primary infection.