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机译:Risk factors for the spread of vaccine-derived type 2 polioviruses after global withdrawal of trivalent oral poliovirus vaccine and the effects of outbreak responses with monovalent vaccine: a retrospective analysis of surveillance data for 51 countries in Africa
Medical Research Council Centre for Global Infectious Disease Analysis Department of Infectious;
Bill & Melinda Gates Foundation;
Regional Office for Africa World Health OrganizationPolio Eradication Department World Health OrganizationExpanded Programme on Immunization Vaccines and Biologicals Department World Health Organization;