Eye worms in cattle in Indiana.

Of 320 Indiana cattle examined for eye worms between Aug 31, 1977 and July 12, 1979, 88 (28%) were found to be infected with Thelazia gulosa and Thelazia skrjabini. Seventeen cattle had eye worms in both eyes and 65 cattle had therm in a single eye (worms from 6 cattle were pooled, thus not included). From 1 to 28 eye worms (mean, 6) were found per infected animal. Breed predilection was not evident, and 3-year-old cattle had the highest proportion of infection.