1 Center for Disease Control and Prevention (CDC).Swine influenza A(H1N1)infection in two children-southern California, March-April2009.Morb Mortal Wkly Rep,2009,58;400-402.
2 Trifonov V,Khiabanian H,Greebaum B,et al.The oring of the recent swine ineinfluenzaA(H1N1) virus infecting humans.Euro Surveill,2009,14;19193.