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  • Title: Efficacy of different dosage levels and administration routes of tilmicosin in a natural outbreak of infectious bovine keratoconjunctivitis (pinkeye).
    Author: Zielinski GC, Piscitelli HG, Perez-Monti H, Stobbs LA, Zimmermann AG.
    Journal: Vet Ther; 2002; 3(2):196-205. PubMed ID: 19750751.
    Abstract:
    A total of 120 purebred Hereford cattle were selected from a herd on a ranch in Argentina that had a severe outbreak of infectious bovine keratoconjunctivitis (IBK, pinkeye) caused by Moraxella bovis. The animals were separated into six treatment groups: a nonmedicated control group, a group that received oxytetracycline at 300 mg injected intrapalpebrally, and four groups that received tilmicosin (Micotil, Elanco Animal Health, Indianapolis, IN; one group injected intrapalpebrally at 300 mg and three groups injected subcutaneously at 2.5, 5, and 10 mg/kg body weight, respectively). Animals were individually observed for resolution of lesions associated with IBK (ocular discharge, blepharospasin, and corneal lesions) every 7 days for 3 weeks. Corneal improvement was significantly better (P< or = .05) for all doses and for either route of injection for tilmicosin compared with no treatment or treatment with oxytetracycline. Tilmicosin given subcutaneously demonstrated a significant (P < or = .05) dose response for overall improvement (one or more score improved, none worsened). Tilmicosin given subcutaneously at 10 mg/kg was significantly more effective than tilmicosin at 2.5 mg/kg, oxytetracycline, and no treatment. Results for tilmicosin at 5 mg/kg were numerically better than no treatment, and tilmicosin at 10 mg/kg was numerically better than the drug given by intrapalpebral injection. Tilmicosin given by subcutaneous injection at 5 or 10 mg/kg was effective against IBK under the conditions of this study.
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