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Inactivation of campylobacter species using pulsed light

Lamont, Y. and Wang, T. and MacGregor, S.J. and Anderson, J.G. and Rowan, N.J. (2003) Inactivation of campylobacter species using pulsed light. In: Society for General Microbiology – 152nd Meeting – –, 2003-04-07 - 2003-04-11.

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The growing numbers of gastroenteritis cases reported annually throughout the world indicates clearly that food and water-borne microorganisms continue to pose a major threat to public health. In developed countries, Campylobacter species account for most of the bacterial cases associated with gastro-intestinal illness. Therefore methods which can reduce or eliminate these problematic organisms are therefore of high importance and warrant investigation. The use of ultraviolet light is becoming an increasingly popular method for reducing the microbial loads on surfaces, packaging, water and air. However, the applicability of traditional UV delivery systems is limited due to long exposure times required with such low intensity emissions. Treatment with pulsed ultraviolet light (PUV), overcomes this problem by emitting highly intense light pulses, and these achieve high levels of microbial inactivation within short timescales. Experiments using different Campylobacter strains have shown that these bacteria are highly sensitive to PUV exposure. Treatment with as few as 5 light pulses has been shown to reduce microbial numbers by ~ 8 log10. Similar inactivation experiments with Escherichia coli and Salmonella enteritidis resulted in 5 and 6 log10 reductions respectively. The latter results highlight the comparative sensitivity of Campylobacter spp to PUV treatment