[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria Garrity et al. 2005
         Order "Enterobacteriales" "Garrity and Holt 2001" nom. nud. see Order Enterobacterales Adeolu et al. 2016
           Family Enterobacteriaceae Rahn 1937 nom. cons. (Approved Lists 1980)
             Genus Klebsiella Trevisan 1885 (Approved Lists 1980) nom. cons.
               [Klebsiella pneumoniae] (Schroeter 1886) Trevisan 1887 (Approved Lists 1980)
                 1 Klebsiella pneumoniae subsp. pneumoniaeᵀ (Schroeter 1886) Ørskov 1984
                 2 Klebsiella pneumoniae subsp. ozaenae (Abel 1893) Ørskov 1984
                 3 Klebsiella pneumoniae subsp. rhinoscleromatis (Trevisan 1887) Ørskov 1984