International travel: Someone can board a plane in the 3rd world incubating an illness, arrive in the us and be at your mall the next day.They can bring a vaccine preventable disease to you or your kids.This has been documented for measles in the houston area this year. Some germs also can travel undetected in asymptomatic people (hib).Each germ has specific features that make vaccine use a long term need.
Answered 12/28/2013
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