European Center for Disease Control and Prevention (ECDC). Rapid risk assessment: severe respiratory disease associated with a novel influenza A virus, A (H7N9) China. Technical reports. ECDC. Updated Risk Assessment 12-04-2013. http://www.ecdc.europa.eu/en/press/news/Lists/News/ECDC_DispForm.aspx
http://www.ecdc.europa.eu/en/publications/Publications/AH7N9.China-rapid-risk-assessment.pdf 3. April 2013
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