This followed a deep-cleaning process known as "fogging", which uses hydrogen peroxide vapour.

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FieldTurf also makes machines for annual deep-cleaning.

ECONOMIST: Monitor

"We can't say for sure how much of that benefit is down to the yoghurt and how much they are down to a whole range of infection control procedures that the hospital has in place such as the deep cleaning programme, the bare-below-the-elbow programme, and the increased isolation procedures, " Ms Heyes said.

BBC: RELATED BBC SITES

But opponents of the deep cleans have been joined by representatives of the companies who, alongside in-house cleaning teams, are responsible for carrying them out, and of the managers responsible for overseeing them.

BBC: RELATED BBC SITES

It measures force to determine 3-dimensional position, such as deep, shallow, horizontal or vertical, and adapts the pool cleaner for maximum cleaning action.

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