Minimum Inhibitory Concentrations of and Adaptation to Five Disinfectants Commonly Used against Salmonella in the Poultry Industry

MIC-tests in replicate were performed on 286 Salmonella isolates (269 from Danish poultry, including 256 from broiler houses, and 17 from England, mainly from poultry) against five disinfectants used in the poultry industry (glutaraldehyde/benzalkonium chloride compound, formaldehyde, oxidising compound, tar oil phenol, iodophor). Generally, the small variations in MIC could not be associated with previous use of disinfectants, persistence or serotypes. Adaptation studies involving the five disinfectants did not alter the MICs beyond the normal biological variation, i.e. within one doubling dilution.