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Data for AFP cases, VAPP cases, nonpolio AFP rates, and vaccination doses in Shandong province (1991 to 2018). (A) Monthly numbers of reported AFP cases and annual nonpolio AFP rates. The red dotted line indicates the target recommended by the WHO. (B) Annual numbers of VAPP cases positive for poliovirus and vaccination doses. A square represents one VAPP case. Abbreviations: AFP, acute flaccid paralysis; VAPP, vaccine-associated paralytic poliomyelitis.
