title: Emerging epidemiology of H7N9 avian flu.
mesh_terms: D000368:Aged; D000818:Animals; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification / Q000472:pathogenicity; D005585:Influenza in Birds / Q000453:epidemiology*; D007251:Influenza, Human / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D009102:Multiple Organ Failure / Q000401:mortality*; D011200:Poultry; D012140:Respiratory Tract Diseases / Q000401:mortality*; D012307:Risk Factors