TY - JOUR AU - Reid, A H; Taubenberger, J K; Fanning, T G TI - Evidence of an absence: the genetic origins of the 1918 pandemic influenza virus JO - Nat Rev Microbiol IS - 11 VL - 2 PY - 2004 DO - 10.1038/nrmicro1027 SP - 909 EP - 914 ER -