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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Which of the following lead to an outbreak of Influenza in China in 2013 -
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The correct answer is  In china, there was an outbreak of influenza caused by Avian influenza H7N9, in 2013.
It started in china and spread to Hong Kong.
Most common age group affected was older male (> 50 years).