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A couple kisses

A couple kisses at the Historic Center, in Mexico City on. An outbreak of deadly swine flu in Mexico and the United States has raised the specter of a new virus against which much of humanity would have little or no immunity. The outbreak of the new multi-strain swine flu virus transmitted from human to human that has killed up to 60 people in Mexico is a 'serious situation' with a 'pandemic potential', the head of the World Health Organization stated.AFP / Getty Images Photo