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Reported rubella cases in mainland China, 1991 to 2007. (a) Number of rubella cases (bars) and average rubella incidence (line with solid diamonds) between 1991 and 2002 in China, as reported by 145 sentinel surveillance sites. (b) Number of rubella cases (bars) and average rubella incidence (line with solid diamonds) between 2004 and 2007 in China, as reported by NDRIS.
