Getting your player ready...
In a startling measure of just how widely a new disease can spread, researchers accurately plotted swine flu’s course around the world by tracking air travel from Mexico.
The research was based on an analysis of flight data from March and April last year, which showed more than 2 million people flew from Mexico to more than 1,000 cities.
Passengers traveled to 164 countries, but four out of five of those went to the United States. That fits with the path of the epidemic a year later. The findings were reported Monday in the New England Journal of Medicine.
