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Alarming 30-fold rise in measles in Europe - WHO
(www.bbc.co.uk)
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Other way around, if I have 2 apples and you have 10-fold more, is where I think it gets confusing. I think there are some limited scientific/mathematics contexts where n-fold refers to powers of 2 but that appears to differ from the colloquial meaning which is just a synonym for times.
I thought infectious diseases was one of those contexts, but I guess not.