Efficacy of different Lysigin formulations in the prevention of Staphylococcus aureus intramammary infection in dairy heifers.

The objective was to compare the efficacy of two experimental Staphylococcus aureus mastitis bacterins and a currently marketed five-isolate-based Staph. aureus bacterin (Lysigin, Boehringer Ingelheim Vetmedica, Inc.) with unvaccinated controls.