Clostridium difficile Spore Reduction

Naga Bonagiri, Scientific Officer
Airmid Health Group Ltd., Ireland
Full Report


To assess the performance of the Defend 1050 / Pro XL in removing aerosolized Clostridium difficile spores.


The impact of the Defend 1050 / Pro XL on aerosolised C. difficile spores was conducted in the 28.5m3 environmental test chamber. The test chamber was preconditioned to 20 ± 3 °C and 55 ± 5% relative humidity.

During the test runs the air purifier was placed in the centre of the test chamber and operated at full speed mode. During the control runs the air purifier was switched off.

The C. difficile spores were nebulised into the chamber for a fixed time and mixed with a ceiling fan.

Biostage impactors were used to sample the air.

Summary of Results

The results achieved during the testing show that the Defend 1050 / Pro XL demonstrated to be effective in reducing the airborne C. difficile by 99.6% within the first 20 minutes and this increased to > 99.9% after 40 minutes.


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