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This study examines the coverage data and number of cases of type 1 vaccine-derived poliovirus in 2000 and 2001, with 21 reported cases. Immunization coverage data for 2007 is not available from country reports. The analysis focuses on the progress towards eradicating polio, highlighting the importance of vaccination programs.
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Immunization Polio Eradication Coverage (%) Number of cases Type 1 vaccine derived virus in 2000 and 2001: 21 cases Coverage data for 2007 not available Source: Country reports