Biocide tolerance of Salmonella isolates recovered from clinically ill cattle

Cleaning and disinfection are common control methods to re­duce Salmonella transmission in cattle herds. However, clean­ing and disinfection protocols have had varied effectiveness against Salmonella in farm environments, and residual contam­ination is often reported. Biocide choice is critical when design­ing effective cleaning and disinfection protocols, yet little is known regarding Salmonella susceptibility to commercial prod­ucts. Our objective was to determine the minimum bactericidal concentration (MBC), defined as ≥ 3 log reduction, of 6 biocides used in livestock production or veterinary medicine. We hy­pothesized that some label guidelines would not substantially reduce Salmonella.