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The UN's World Health Organization (WHO) has raised the alert over swine flu to level five - one short of a full-blown global epidemic, or pandemic.
A phase five alert means human-to-human transmission in at least two countries.
Director General of WHO, Dr Margaret Chan urged all countries to activate their pandemic plans, including heightened surveillance and infection-control measures.
She said action should be undertaken with "increased urgency".
She added: "It really is the whole of humanity that is under threat in a pandemic."
But she also said the world was "better prepared for an influenza pandemic than at any time in history".
Ms Chan said that for the first time, the pandemic could be tracked in real time.
This was necessary, she added, because the virus could mutate at any time into a more dangerous strain - or a milder one.
Meanwhile, the Scottish and UK governements are continuing to monitor the situation closely with five confirmed cases here in Britain.
