Water line biofilm regrowth dynamics in six wean-to-finish farms post peracetic acid water line cleaning and disinfection.

Biofilm quantities on sample collection time point 77 remained elevated over pre-treatment (0) quantities and the comparison was nearly statistically significant (adjusted p-value = 0.0513).

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However, pre-treatment (0) CFU/mL estimates compared to 7,14, 21, 42, and 56 post-treatment estimates increased above original biofilm quantities and were significantly different or approaching significance (Table 2 ).

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This contrasts the present study’s results as non-significant biofilm quantities from pre-treatment (0) were achieved at 3 and 5 days post-treatment, however, were not achieved again until collection time point 77, which only approached significance.

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