Our expert says:
I'm assuming here you mean a drinking water fountain (i.e. as opposed to a decorative public water fountain)?
The risks from drinking water fountains are low, but that said, there have been a few cases of contamination and disease outbreaks from them. Your family is also in a special category, where you have to be particularly careful, so I don't think it's excessive for your younger son to follow this simple rule.
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