During 2009, a total of 10,844 laboratory-confirmed cases of pandemic (H1N1) 2009 were reported in Beijing, People's Republic of China. However, because most cases were not confirmed through laboratory testing, the true number is unknown. Using a multiplier model, we estimated that ≈1.46-2.30 million pandemic (H1N1) 2009 infections occurred.
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Wang et al. (2010) studied this question.
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