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WPSAR Vol 4, No 4, 2013 | doi: 10.5365/wpsar.2013.4.3.006 www.wpro.who.int/wpsar 24 a Hainan Medical University, People’s Republic of China (e-mail: wviroj@yahoo.com). Submitted: 13 September 2013; Published: 00 October 2013 doi: 10.5365/wpsar.2013.4.3.006 The recent report on human infections with avian influenza A(H7N9) is very interesting.1 The age distribution of the patients was studied, and Arima et al. mentioned that “it seems unlikely that elderly men are being overly selected.”1 It is true that the virus can attack any age group. The things that determine vulnerability to infection in each age group include (1) immunity to infection, (2) exposure to the disease, (3) availability of medical care, and (4) ability of medical personnel to diagnosis the illness.

Letter to the Editor: Human infections with avian influenza A(H7N9) virus in China: preliminary assessments of the age and sex distribution