H7N9 snapdate: age and sex pyramid for 227 laboratory confirmed cases

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Disease due to H7N9 infection is still most severe among males, as it was from very early on in the outbreak in 2013. 

Males comprise 68% of all cases.

The median age is 58-years and the median 54-years.

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If we follow some age bands with time we can see that since the last update 5-Feb, the 50-69-year age band has settled in as the most frequent source of H7N9 cases in China and a spike in younger cases occurs in the last week of Jan and 1st week of Feb.