ABSTRACT

 The anti microbial activities of three commonly used disinfectants Septol, Dettol and Z-germicides against Escherichia coli. Staphylococcus aureus and Candida albicans were investigated. Their efficacy was determined using the agar diffusion method at different concentrations of the test disinfectants and their potency was tested against a standard (phenol) by using phenol coefficient tests. The use of Septol on E.coli and S.aureus showed weak bactericidal efficacy with a zone of inhibition of 30mm and 29mm at 100% concentrations as compared with the others, even at their in use dilutions, although it posses a high efficacy on C.albicans with a zone of inhibition of 75mm. Dettol and Z-germicides had equal inhibitory effects of 45mm on E.coli and S.aureus at 100% concentrations but Dettol was more effective, even at the in use dilutions as compared to Zgermicides, although S.aureus was observed to be the most susceptible to Z-germicides when used in higher concentrations. It was observed that as the concentration reduces, the susceptibility rates of the test organisms increases. The potency of the disinfectants against a standard disinfectant (phenol) showed that they were all effective than phenol with Dettol being the most potent/effective disinfectant as compared with Z-germicide and Septol. To ensure disinfectants efficacy, test should be carried out on new disinfectant products and also further studies should be carried out about disinfectants.