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. 2013 Nov 7;8(1):1–7. doi: 10.1111/irv.12196

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© 2013 The Authors. Influenza and Other Respiratory Viruses Published by John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Age-specific monthly numbers of hospitalizations and deaths of patients with laboratory-confirmed influenza A(H1N1pdm09) virus infections in Hong Kong, April 2009 through July 10. (A) Hospitalizations of patients with confirmed influenza A(H1N1pdm09). (B) Deaths of patients with confirmed influenza A(H1N1pdm09). Confirmed influenza A(H1N1pdm09) virus infection was a reportable condition between April 2009 and July 2010. Data on laboratory-confirmed influenza A(H1N1pdm09) virus infections were extracted from the e-flu electronic database collated by the Hospital Authority. The changes in age pattern after the peak of the first wave of influenza A(H1N1pdm09) in October 2009 could partly be attributed to recommendations for the reduced use of laboratory testing and admission of suspected cases. Laboratory-confirmed influenza A(H1N1pdm09) hospitalizations and deaths were not available after July 2010.