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Beware of second wave of swine flu: WHO

The World Health Organisation is urging people around the world to brace themselves for a second wave of the swine flu pandemic as the heavily populated northern hemisphere edges towards the cooler season when flu thrives. WHO Director General Margaret Chan warned on Friday that there had been instances of second and third waves when pandemics had struck earlier."We cannot say for certain whether the worst is over or the worst is yet to come," Chan said.