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| Brits can give blood in the UK, I don't believe a worldwide ban exists so I suspect the true answer is not multiples of 7. | |
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Of course there is no worldwide ban - there is no organization that could enforce this, but many countries do not allow people who lived in Britain between the 80s and mid 90s to donate...e.g.
USA
Most of Europe
Australia
Canada
HK
etc etc