The UK's Mike Saltmarsh has been actively involved in a study to investigate the microbiology of a traditional style, hot beverage, vending machine over an extended period of time, providing a unique insight into the development of a microbial population within a new hot-drinks vending machine.
The study used a real-life situation, where a vending machine selling only hot chocolate was placed on the University of Wales campus, in Cardiff. The study confirmed that populations of spore-forming bacteria, including Bacillus cereus, do develop in machines, stressing the need for good hygiene management by operators.
More importantly, results showed that regular cleaning with detergent and hot water was sufficient to achieve a significant reduction in the microbial load, both of the mixing bowl and the vended drink, keeping the number of bacteria well within safe limits. A further study will examine alternative cleaning protocols.
This research was carried out as part of a UK Government-funded Knowledge Transfer Partnership between the University of Wales Institute, Cardiff and the Automatic Vending Association.
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