Ninety-six commercially available teat disinfectant products, with different active ingredients of varying concentrations, were tested against bacteria, isolated from the teat skin of Irish dairy cattle, using a teat skin swabbing method. The teat disinfectant products were either ready-to-use (RTU) (n = 82) concentrate (conc.) products (n = 9) or required activation before use (n = 5). Concentrate products were diluted to a usable concentration, using sterile distilled water (according to the manufacturer’s recommendation), to avoid possible issues with water hardness or contaminated water. Five chlorine dioxide products (Product number 11, 70, 89, 90 and 95) were mixed with an activator before use, according to the manufacturer’s recommendations. The disinfectant products used were recommended either for both pre- and post-milking teat disinfection (n = 49), pre-milking teat disinfection only (n = 3), or post-milking disinfection only (n = 44). These products were all tested under the same environmental conditions i.e. the same milking parlour, cows, farm, climate conditions and with the same laboratory methods to ensure comparable results regarding the effectiveness of the different teat disinfectant products. Information regarding the products used is shown in Table 1.

LS-means of Log10 percentage reduction (%) for each teat disinfection product, within each ingredient group, against streptococcal and staphylococcal isolates

^RTU+Concentrate *Requires activation before used

1 Ingredient/working solution as declared by the manufacturer

a −e Inhibition not sharing the same superscript in a column within an ingredient group were significantly different (P < 0.05)

Teat disinfection products listed is not an indication of the regulatory status of the products. Check the department of Agriculture, Food and Marine (DAFM) Biocidal Products Register ( and Health Products Regulatory Authority (HPRA) ( before purchase

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