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how does the ease of plane travel make us more susceptible to infection?

how does the ease of plane travel make us more susceptible to infection?

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Last updated by jill d #170087
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People who are sick or incubating the virus (they are not aware that they are sick) can move internationally with ease. Once they are in a new country, they can infect people without even knowing it. 

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http://www.gradesaver.com/the-hot-zone/q-and-a/how-does-the-ease-of-plane-travel-make-us-more-susceptible-to-infection-230346