[Bactericidal effect of iodophors of Czechoslovak origin on support materials]

The bactericidal effectiveness of Jodofor A and Jodofor B produced in Czechoslovakia was tested on carriers (stoneware, concrete, brick, wood, aluminium sheet) contaminated with E. coli and St. aureus. The two Czechoslovak products were compared with Iosan produced by the Ciba-Geigy Comp. Cold water solutions of iodophores were applied in fine spray to horizontal and vertical carriers at two stages with a one-hour interval; the over-all application rate was 1 lt. of solution per 1 m-2 of area. One-hour exposure time from the last application was respected in all cases. On carriers contaminated with E. coli the microorganisms were totally killed by a 1.5% water solution of Jodofor A and Iosam. In Jodofor B the same effect was achieved only with the 2.5% water solution. In St. aureus-contaminated carriers a 100% disinfecting effect was obtained with a 2% water solution of Jodofor A and Iosan and witha 2.5% solution of Jodofor B. Different effectiveness in the disinfectibility of different materials was suggested, and the effect was not found dependent on the position of the material disinfected (vertical, horizontal positions). This testifies to quite a rapid disinfecting effect of iodophores. No large differences in the overall bactericidal effectiveness between Jodofor A and Iosan (Ciba-Geigy) were found either in the evaluation of 100% disinfecting effect or in the use of lower concentrations which only reduced the number of germs surviving on carriers. The effectiveness of Jodofor B was somewhat lower.