Infectious keratoconjunctivitis is a significant ocular disease found in confined sheep. Little information about the aetiological agents and their antimicrobial susceptibility is available. There is limited information on the aetiological agents involved in keratoconjunctivitis outbreaks in sheep. The present research aimed to determine the bacterial aetiological factors involved in an outbreak of infectious keratoconjunctivitis in confined lambs. Ocular swabs were collected from 23 randomly selected lambs, which were classified into three groups according to the severity of the lesion: group I (=6; no ocular involvement), group II (=8; less severe injuries) and group III (=9; more severe injuries). Isolation of aerobic bacteria and antimicrobial susceptibility tests were carried out. Molecular detection of was performed, and positive samples were tested to confirm the presence of the following species: , and subsp. . sp. and were detected in all groups, but we inferred that sp. are only significant in the early stages of the disease. was detected in all tested groups, while was detected in samples of group III only. One strain of sp. was resistant to erythromycin and showed intermedite resistance to tetracycline. The presence of these species confirms their importance in the aetiology of this disease, and the low resistance profile observed in the studied farm suggested an increased cure success rate.
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