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The activity of glutaraldehyde (GTA) at low concentrations (less than 2%) against poliovirus was assessed by a suspension procedure. The inactivation kinetics showed that concentrations of less than or equal to 0.10% were effective against purified poliovirus at pH 7.2; a 1 log10 reduction was obtained in 70 min with 0.02% GTA, and a 3 log10 reduction was obtained in 30 min with 0.10% GTA. GTA activity at low concentrations was greatly enhanced at alkaline pH, but was completely abolished at acid pH. In contrast, the inactivation assays on poliovirus RNA showed that it was highly resistant to GTA at concentrations up to 1.0% at pH 7.2. At pH 8.3 a low inactivation was noticed with 1.0% GTA. Our results are of relevance to hospital practice in digestive endoscopy investigations because there has been an increasing tendency to use low concentrations of GTA and very short contact times in disinfection procedures.

applied and environmental microbiology

Activity of glutaraldehyde at low concentrations (less than 2%) against poliovirus and its relevance to gastrointestinal endoscope disinfection procedures