Evaluation of Nine Teat Dip Formulation Under Experimental Challenge to Staphylococcus Aureus and Streptococcus Agalactiae

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Abstract
Nine postmilking bovine teat dips were evaluated by an experimental challenge model against either S. aureus, S. agalactiae or both. Formulations containing 0.9 and 0.6% NaClO, 1% sodium dichloro-S-triazenetrione, 0.55% chlorhexidine gluconate and 0.35% povidone-iodine reduced incidence of S. aureus infections 56.8, 28.3, 75.9, 92.5 and 77.9%, respectively. Incidence of infections with S. agalactiae was reduced 48.1 and 63.2% by 1.7 and 1% sodium dichloro-S-triazenetrione formulations, respectively. The 1% chlorhexidine gluconate and 0.35% povidone-iodine products reduced S. agalactiae infections 71.0 and 67.0%, respectively. Three experimental 1% iodophor formulations reduced S. agalactiae infections 28.9, 44.8 and 50.7%, respectively. The experimental challenge model was further refined and provided an efficient method to determine efficacy of post-milking teat dips.