I'd never heard of this till I read this thread early today. I picked up my son from school and he came out clutching a musical instrument that he had made from an egg box!
Surely if toilet rolls are a risk then so are kitchen towel tubes. If they have been in the kitchen then changes are they've been touched by hands that have also touched eggs, perhaps raw meat, etc. After all, we use them to clean mess.
Its not something that as a parent I would worry about, you can be too careful IMO.
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