• Phase five is marked by human-to-human spread of the virus into at least two countries in the same area of the world.

    VOA: special.2009.05.06

  • The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

    VOA: standard.2009.05.14

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