This is a question on the lips of everyone these days, with governments issuing contradictory warnings about avoiding the countries affected by swine flu. But travelers as nervous reconsider the planned Mexican vacation, officials of the World Health Organization (WHO) does not suggest travel be restricted, and they do not believe it will make a difference in the path of the virus.
Computer modellers have studied this issue, too, and they tend to come down on the side of the WHO things, even if not everyone agrees with them. A previous Science analysis of the issue by journalist Martin Enserink can be found here.
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