[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order "Enterobacteriales" Garrity and Holt 2001 nom. nud.
           Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
             Genus Klebsiella Trevisan 1885 (Approved Lists 1980)
               [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