US prepares ground for security clampdown.
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D023482:Bioterrorism / Q000517:prevention & control; D006076:Government; D017408:Guidelines as Topic; D011643:Publishing / Q000331:legislation & jurisprudence*; D012106:Research / Q000193:education; D012637:Security Measures / Q000191:economics / Q000331:legislation & jurisprudence*; D023481:Terrorism / Q000517:prevention & control*; D014481:United States