| prolonged occurrence of moraxella bovis infection on a restricted heifer farm. | an epizootiologic study was conducted for infectious bovine keratoconjunctivitis (ibk) on a large grassland farm rearing a total of 1,300-1,400 heifers during may to october in both 1991 and 1992. heifers were examined for infection with moraxella bovis, and isolation of m. bovis from the affected eyes and from asian face flies (musca bezzii patton et cragg) swarming on the heifer face was carried out. during the observation period, 10.7% of the heifers in 1991 and 5.3% of the heifers in 1992 we ... | 1994 | 7948367 |