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Modification of the Excised Teat Germicidal Activity Assay.

P A Murdough1, A Rutherford1, J W Pankey1

  • 1Department of Animal Sciences, University of Vermont, Burlington, Vermont 05405.

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Summary

The modified Excised Teat Assay using ultrasonic cleaning improved consistency for inexperienced technicians evaluating bovine teat sanitizers. This method enhances bacterial removal for more reliable germicidal activity testing.

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Area of Science:

  • Veterinary Microbiology
  • Antimicrobial Efficacy Testing

Background:

  • Bovine teat sanitizers are crucial for preventing mastitis in dairy cattle.
  • The Excised Teat Assay is a standard in vitro method for evaluating sanitizer efficacy.
  • Optimizing assay procedures is essential for accurate and reproducible results.

Purpose of the Study:

  • To compare a modified rinse procedure using an ultrasonic cleaner with the standard method in the Excised Teat Assay.
  • To assess the impact of technician experience on the performance of the modified and standard rinse procedures.
  • To determine if ultrasonic cleaning enhances the reliability of bovine teat sanitizer evaluation.

Main Methods:

  • The Excised Teat Assay was performed using standard and ultrasonic cleaner-assisted rinse procedures.
  • A 1% iodine sanitizer, a chlorhexidine sanitizer, and a control were tested against Staphylococcus aureus.
  • Bacterial removal from excised bovine teats was evaluated by experienced and inexperienced technicians.

Main Results:

  • No significant differences were found between rinse procedures when performed by an experienced technician.
  • Significant differences between procedures and within treatments were observed when an inexperienced technician performed the assay.
  • The ultrasonic modified rinse procedure yielded more consistent results with inexperienced technicians.

Conclusions:

  • Ultrasonic cleaning in the Excised Teat Assay rinse step improves procedural consistency, particularly for less experienced personnel.
  • The modified assay offers a more reliable method for evaluating the germicidal activity of bovine teat sanitizers.
  • This enhancement can lead to more accurate assessments of sanitizer effectiveness in dairy herd health management.