Assertion: swine flu's case | /r/CapableOf | prevent flu developing
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text: On 25 June the chief medical officer Sir Liam Donaldson said certain areas were seeing rapid community spread which meant that it was no longer practical to attempt in those areas (initially parts of London, the west Midlands and east Berkshire) to put a ring around the outbreaks by tracing the people with whom confirmed cases have come into contact and giving them drugs to try to prevent flu developing.