WHO risk assessment of human infection with avian influenza A(H7N9) virus (June 2014)

On 27 June 2014 WHO conducted a risk assessment in accordance with the WHO recommendations for rapid risk assessment of acute public health events.

Summary of surveillance and investigation findings 

Human cases of avian influenza A(H7N9) virus infection to date 

A total of 450 laboratory-confirmed cases of human infection with avian influenza A(H7N9) virus, including 165 deaths, have been reported to WHO: 435 cases by China National Health and Family Planning Commission, four cases by the Taipei Centers for Disease Control (Taipei CDC), ten cases by the Centre for Health Protection, China, Hong Kong SAR, and one case in a Chinese traveller, reported from Malaysia. Since June 2013 (second wave) until 27 June 2014, 317 cases were reported1. The age and sex distribution of cases was fairly similar in first and second wave. Overall, most cases have occurred in middle-aged and older men, a few in children and even fewer in teenagers and young adults. The median age is 58 years (first wave 62; second wave 57). Infections in men are more frequently reported than those in women. The case fatality rate among reported cases from both waves is 36% although this might change as some patients are still hospitalized in critical condition. As in the first wave, most of the human cases reported in the second wave have been considered severe, with the exception of children, who have been presenting with milder clinical symptoms. 

Read the full WHO Risk Assessment as of 27 June 2014:  http://who.int/influenza/human_animal_interface/influenza_h7n9/riskasses...

 

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