Possible origin of current influenza A H1N1 viruses.
Zhang
Hong
H
Chen
Ling
L
D004196:Disease Outbreaks; D014943:Global Health; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics*; D007251:Influenza, Human / Q000821:virology*