<P> The CDC's Biosafety Level 4 laboratories are among the few that exist in the world, as well as one of only two official repositories of smallpox in the world . The second smallpox store resides at the State Research Center of Virology and Biotechnology VECTOR in the Russian Federation . </P> <P> The CDC revealed in 2014 that it had discovered several misplaced smallpox samples and also that lab workers had potentially been infected with anthrax . </P> <P> The CDC is organized into "Centers, Institutes, and Offices" (CIOs) which allow it to be responsive and effective in its interface with public health concerns . Each organizational unit implements the agency's response in a particular area of expertise . Within "Offices" are Centers, Divisions, and Branches . </P> <P> CIOs are: </P>

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