equine influenza virus subtype H3N8 H3N8 EIV
H1N1 subtype influenza A virus
Influenza A virus H1N1 subtype
influenza A virus subtype H1N1
2009 swine-origin influenza A(H1N1) virus
avian influenza A H5N1 virus
avian influenza A(H9N2) virus
Avian influenza virus H5N1 subtype
Avian influenza virus H9N2 subtype
H5N1 subtype influenza virus
H9N2 subtype influenza virus
influenza A (H1N1) virus infection
influenza A (H9N2) virus
influenza A H1N1 influenza
Influenza A H1N1 virus infection
Influenza A H1N1 virus nucleic acid