Pharmacy workers

Pharmacy workers wait for customers while wearing surgical masks along Revolucion Avenue in Tijuana, Mexico. The World Health Organization (WHO) warned countries around the world on Saturday to be on alert for any unusual flu outbreaks after a unique new swine flu virus implicated in possibly at least 60 human deaths in North America.

( Getty Images Photo / April 26, 2007 )

Pharmacy workers wait for customers while wearing surgical masks along Revolucion Avenue in Tijuana, Mexico. The World Health Organization (WHO) warned countries around the world on Saturday to be on alert for any unusual flu outbreaks after a unique new swine flu virus implicated in possibly at least 60 human deaths in North America.

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