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In March 2013, an influenza outbreak caused by the novel avian‐origin H7N9 influenza A virus emerged in eastern China and had caused 43 fatalities by 31 July 2013, although the basis for disease pathogenesis still remains unclear. To assess the immunological and viral factors associated with disease severity, viral RNA and inflammatory cytokines were quantified for 18 H7N9 patients in Shanghai, China...
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