Efficacy of Low Concentration Iodophor Teat Dips Against Staphylococcus Aureus

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Abstract
Four [cow] teat dips formulated at different concentrations of I were evaluated by experimental challenge with S. aureus (Newbould 305). Teat dip, I contents and efficacies were: 0.1, 0.3 and 0.5%; 73.0, 70.8 and 74.9%; 0.25 and 0.5%; 55.8 and 64.6%; 0.1 and 0.5%; 74.8 and 70.0%; and 0.05, 0.1, 0.25 and 1.0%; 79.5, 82.6, 80.7 and 94.4%. Products with low concentrations of I were highly effective in reducing incidence of S. aureus infections with no significant differences within formulation from I content. The experimental challenge model provided an efficient method for evaluating efficacy of postmilking teat dips.