Word: traveller
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Those measures include strengthening surveillance of travelers entering the U.S., examining and testing people who might be exhibiting flu-like symptoms and alerting U.S. citizens in Mexico, where the disease still seems to be at its worst. Meanwhile, other countries have placed far stronger restrictions on travel to Mexico, in an effort to cut off the spread of the disease. Cuba and Argentina have temporarily banned flights to and from Mexico, Japan has stopped giving visas to Mexicans who arrive in the country, and France is putting forward a request to suspend all flights between the European Union and Mexico...
...virus is already present in so many countries, and readily capable of spreading from person to person, it's far too late to try to isolate one or two countries. Although uninfected countries may be able to delay the introduction of swine flu by imposing draconian limits on international travel, they would not likely be able to stave off the virus for good - and the economic losses resulting from the travel ban may far outweigh any benefits. One 2007 study by the Brookings Institution estimated, for example, that a 95% reduction in U.S. air travel would cost the economy...
...Once the virus has spread beyond its initial focus, travel restrictions just aren't effective," says Ira Longini, a biostatistician at the University of Washington. With 4,000 flights a day between the U.S. and Mexico, "it's not worth the social disruption it would cause...
That's not to say that very strict restrictions wouldn't have some effect on slowing the virus. In a 2006 study, Harvard epidemiologists John Brownstein and Kenneth Mandl examined the effect of the sharp reduction in air travel after the Sept. 11 attacks on that year's flu season. They found that the initial flight ban and general decline in air travel in the weeks after delayed the onset of the flu season but did little to reduce the overall number of infections and deaths that year...
...data matches computer models run by biostatisticians like Longini, who found that even the strictest limits on air travel would only slow the start of a flu pandemic, not stop its spread. But, again, while that strategy may benefit countries that have not yet been infected with swine flu, there's still no way to know when it would be safe to lift those restrictions. "There's no question that air travel spreads the flu," says Mandl, a physician and researcher at the informatics program at Children's Hospital Boston and an associate professor at Harvard Medical School...