<div><p>GENEVA (Reuters) - The H1N1 flu pandemic may not be conquered until 2011 and continued vigilance is required against the virus which can still mutate, the head of the World Health Organization said on Tuesday.</p><p>WHO Director-General Margaret Chan also warned that although countries have shored up their defenses ...

<div><p>World Health Organisation chief Margaret Chan warned Tuesday against complacency on the swine flu pandemic, noting that influenza viruses are "highly unpredictable" and could still mutate.</p><p>"One thing we need to guard against is a sense of complacency. Viruses are highly unpredictable. We should not be taken by ...

<div><p>World Health Organisation chief Margaret Chan said Tuesday it was too early to declare victory over swine flu and insisted that measures taken to deal with the pandemic were justified.</p><p>"I think that we must remain prudent and observe the evolution of the pandemic over the next six ...