A note on the suitability of 'dip slides' for the microbiological examination of water and aqueous non-sterile pharmaceutical preparations.

The suitability of four brands of dip slides for the examination of purified water was studied. Especially when used in combination with a calibrated inoculating device reliable results were obtained. The usefulness for this purpose of the selective media present on three of the four brands is questionable, unless a previous resuscitation technique has been applied.