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 Chang Jile, Deputy Director of the State Administration for Disease Control and Prevention, said at the press conference held on the 12th of the Joint Prevention and Control Mechanism of the State Council that on the basis of the ninth version of the prevention and control plan, the 20 optimization measures have optimized and adjusted the management and control of risk personnel, the delineation of risk areas, the management and control of inbound personnel, medical services and vaccine inoculation, and the prevention and control of key sites. These adjustments are based on the experience summary and relevant assessment data of epidemic prevention and control practices in many places.