[Bacterial age and their susceptibility to disinfectants]

The comparative tests were carried out on 4 standard test microorganisms grown 24 h, 48 h, 72 h, with regard to their susceptibility to 6 disinfectants. The activity of disinfectants was examined by Berry and Bean method--mean single survival time (MSST). The results indicate that 24 h grown bacteria have the lowest susceptibility to phenol, Septyl, formalin, glutaraldehyde, chloramine and Sterinol. The MSST of these short time grown bacteria was 2-3 times longer than that of 72 h grown.