Metalic copper effective against new E. coli strains

3 June 2011

As the World Health Organisation suggests that the E. coli strain found in the outbreak in Germany (O104:H4) has never been seen before, a study by the University of Southampton has found a role for copper in preventing the spread of similar infections.

Professor Bill Keevil, Head of the Microbiology Group and Director of the Environmental Healthcare Unit at the University of Southampton, explains: "A study looking at copper's efficacy against new strains of E. coli has just been completed. Although it did not specifically look at O104, all the strains investigated have died rapidly on copper."

Professor Keevil will present the findings at the forthcoming WHO International Conference on Prevention and Infection Control in Geneva on 30 June.

On a dry copper surface, the study shows 10 million E. coli bacteria are eliminated within 10 minutes. On a wet copper surface, one could expect a total kill within around 45 minutes. This antimicrobial property is inherent to the metal, and shared with alloys such as brass and bronze.

In the wake of this outbreak, hand washing and careful food preparation have been highlighted as key concerns, as has cross-contamination. Any raw food placed on a work surface can contaminate other food, or have bacteria transferred onto it from previous items resting there.

Deployed as a touch surface in food preparation areas, copper will continuously kill any pathogens that settle on it, reducing the risk of cross-contamination, and helping to prevent the spread of infection.

Source: Southampton University.


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