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Yep, I said a while ago in this thread that a likely infection vector will be something to do with catering.
There are HSE guidelines on washing hands after handling used cutlery, no idea how it relates to washing after handling customer supplied cups. I guess the chances of infection is very low if there's no highly contagious bug going round.
I was more thinking along the lines of staff handling them after customer use, along the same lines as the reusable cup use.