Abstract
An outbreak of infectious kerato-conjunctivitis in 25 adult ewes is reported. Mycoplasma conjunctivae was frequently isolated from most eyes prior to treatment. Although treatment was effective in regressing the clinical signs of the disease, there was continued and increased isolation of M. conjunctivae in all eyes (50) treated for 6 days on days 14, 44 and 74 following treatment. It is suggested that the carrier animals and contact between sheep were responsible for the spread of infection with M. conjunctivae. The antibody response assayed by the Metabolism Inhibition test (MIT) showed an increase in geometric mean titre (GMT) from 51 on day 0 (first day of treatment) to 72 on day 7 after treatment and fell to 24 by day 74. The persistence and difficulty of eliminating M. conjunctivae from affected eyes after treatment is discussed.
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