Most of the US is vulnerable to small pox
Quote:
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Are previous vaccinations still protective? Routine vaccination of the general population in the United States stopped after 1980. Vaccination of military personnel was discontinued in 1989. Researchers estimate that vaccinated people retain immunity for about 10 years, although the duration has never been fully evaluated. Therefore, the current population in the United States is considered vulnerable to smallpox. About 42% of the US population is younger than 30 years and has never been vaccinated.
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Smallpox
Edit: and I too believe, nothing specifically disastrous will happen in 2012, it's only the beginning-and-ending of something much more significant