| Spezies | Risiko- gruppe | Bemer- kungen | Status |
| Kaistella → Chryseobacterium | |||
| Kaistella koreensis → Chryseobacterium koreense | |||
| Kaistia | |||
| Kaistia adipata | 1 | ||
| Kaistia dalseonensis | 1 | ||
| Kaistia defluvii | 1 | ||
| Kaistia geumhonensis | 1 | ||
| Kaistia granuli | 1 | ||
| Kaistia hirudinis | 1 | ||
| Kaistia soli | 1 | ||
| Kaistia terrae | 1 | ||
| Kallipygia | |||
| Kallipygia massiliensis | 1 | ||
| Kallotenue | |||
| Kallotenue papyrolyticum | 1 | ||
| Kandleria | |||
| Kandleria vitulina (Lactobacillus vitulinus) | 1 | ||
| Kangiella | |||
| Kangiella aquimarina | 1 | ||
| Kangiella geojedonensis | 1 | ||
| Kangiella japonica | 1 | ||
| Kangiella koreensis | 1 | ||
| Kangiella marina | 1 | ||
| Kangiella profundi | 1 | neu | |
| Kangiella sediminilitoris | 1 | ||
| Kangiella spongicola | 1 | ||
| Kangiella taiwanensis | 1 | ||
| Keratinibaculum | |||
| Keratinibaculum paraultunense | 1 | neu | |
| Kerstersia | |||
| Kerstersia gyiorum | 2 | ||
| Kerstersia similis | 2 | ||
| Ketogulonicigenium | |||
| Ketogulonicigenium robustum | 1 | ||
| Ketogulonicigenium vulgare | 1 | ||
| Kibdelosporangium | |||
| Kibdelosporangium albatum → Allokutzneria albata | |||
| Kibdelosporangium aridum subsp. aridum | 1 | ||
| Kibdelosporangium aridum subsp. largum | 1 | ||
| Kibdelosporangium banguiense | 1 | neu | |
| Kibdelosporangium kanagawaense | 1 | neu | |
| Kibdelosporangium lantanae | 1 | neu | |
| Kibdelosporangium metalli | 1 | neu | |
| Kibdelosporangium philippinense | 1 | ||
| Kibdelosporangium phytohabitans | 1 | ||
| Kibdelosporangium rhizosphaerae | 1 | neu | |
| Kibdelosporangium rhizovicinum | 1 | neu | |
| Kiloniella | |||
| Kiloniella antarctica | 1 | neu | |
| Kiloniella laminariae | 1 | ||
| Kiloniella majae | 1 | neu | |
| Kiloniella spongiae | 1 | neu | |
| Kineococcus | |||
| Kineococcus aurantiacus | 1 | ||
| Kineococcus aureolus | 1 | neu | |
| Kineococcus endophyticus | 1 | ||
| Kineococcus glutinatus | 1 | ||
| Kineococcus gynurae | 1 | ||
| Kineococcus gypseus | 1 | neu | |
| Kineococcus mangrovi | 1 | neu | |
| Kineococcus marinus → Pseudokineococcus marinus | |||
| Kineococcus radiotolerans | 1 | ||
| Kineococcus rhizosphaerae | 1 | ||
| Kineococcus terrestris | 1 | neu | |
| Kineococcus xinjiangensis | 1 | ||
| Kineosphaera | |||
| Kineosphaera limosa | 1 | ||
| Kineosporia | |||
| Kineosporia aurantiaca | 1 | ||
| Kineosporia babensis | 1 | ||
| Kineosporia mesophila | 1 | ||
| Kineosporia mikuniensis | 1 | ||
| Kineosporia rhamnosa | 1 | ||
| Kineosporia rhizophila | 1 | ||
| Kineosporia succinea | 1 | ||
| Kineothrix | |||
| Kineothrix alysoides | 1 | neu | |
| Kingella | |||
| Kingella denitrificans | 2 | ||
| Kingella indologenes → Suttonella indologenes | |||
| Kingella kingae | 2 | ||
| Kingella negevensis | 2 | neu | |
| Kingella oralis | 2 | ||
| Kingella potus | 1 | ht+ | |
| Kinneretia | |||
| Kinneretia asaccharophila | 1 | ||
| Kiritimatiella | |||
| Kiritimatiella glycovorans | 1 | neu | |
| Kistimonas | |||
| Kistimonas asteriae | 1 | ||
| Kistimonas scapharcae | 1 | ||
| Kitasatoa → Streptomyces | |||
| Kitasatoa diplospora – synonym: Kitasatoa purpurea → Streptomyces purpureus | |||
| Kitasatoa kauaiensis – synonym: Kitasatoa purpurea → Streptomyces purpureus | |||
| Kitasatoa nagasakiensis – synonym: Kitasatoa purpurea → Streptomyces purpureus | |||
| Kitasatoa purpurea → Streptomyces purpureus | |||
| Kitasatospora | |||
| Kitasatospora aburaviensis (Streptomyces aburaviensis) | 1 | Umb. | |
| Kitasatospora albolonga (Streptomyces albolongus) | 1 | Umb. | |
| Kitasatospora arboriphila | 1 | ||
| Kitasatospora atroaurantiaca (Streptomyces atroaurantiacus) | 1 | ||
| Kitasatospora aureofaciens (Streptomyces aureofaciens) | 1 | Umb. | |
| Kitasatospora azatica (Streptomyces azaticus) | 1 | ||
| Kitasatospora cheerisanensis | 1 | ||
| Kitasatospora cineracea | 1 | ||
| Kitasatospora cinereorecta (Streptomyces cinereorectus) | 1 | Umb. | |
| Kitasatospora cochleata (Streptomyces cochleatus) | 1 | ||
| Kitasatospora cystarginea = Streptomyces cystargineus | 1 | ||
| Kitasatospora fumigata ("Streptomyces chrysomallus subsp. fumigatus") | 1 | Umb. | |
| Kitasatospora gansuensis | 1 | ||
| Kitasatospora griseola = Streptomyces griseolosporeus | 1 | ||
| Kitasatospora herbaricolor (Streptomyces herbaricolor) | 1 | Umb. | |
| Kitasatospora kazusensis | 1 | ||
| Kitasatospora kifunensis (Streptomyces kifunensis) | 1 | ||
| Kitasatospora mediocidica = Streptomyces mediocidicus | 1 | ||
| Kitasatospora misakiensis (Streptomyces misakiensis) | 1 | Umb. | |
| Kitasatospora niigatensis | 1 | ||
| Kitasatospora nipponensis | 1 | ||
| Kitasatospora paracochleata (Streptomyces paracochleatus) | 1 | ||
| Kitasatospora paranensis | 1 | ||
| Kitasatospora phosalacinea = Streptomyces phosalacineus | 1 | ||
| Kitasatospora psammotica (Streptomyces psammoticus) | 1 | Umb. | |
| Kitasatospora purpeofusca (Streptomyces purpeofuscus) | 1 | Umb. | |
| Kitasatospora putterlickiae | 1 | ||
| Kitasatospora saccharophila | 1 | ||
| Kitasatospora sampliensis | 1 | ||
| Kitasatospora setae = Streptomyces setae | 1 | ||
| Kitasatospora terrestris | 1 | ||
| Kitasatospora viridis | 1 | ||
| Klebsiella | |||
| Klebsiella aerogenes (Klebsiella mobilis) = Enterobacter aerogenes | 2 | ht | Umb. |
| Klebsiella alba – synonym: Klebsiella quasipneumoniae subsp. similipneumoniae | Umb. | ||
| Klebsiella granulomatis (Calymmatobacterium granulomatis) | 2 | ||
| Klebsiella grimontii | 2 | neu | |
| Klebsiella michiganensis | 2 | neu | |
| Klebsiella mobilis → Klebsiella aerogenes | Umb. | ||
| Klebsiella ornithinolytica → Raoultella ornithinolytica | |||
| Klebsiella oxytoca | 2 | ht | |
| Klebsiella ozaenae → Klebsiella pneumoniae subsp. ozaenae | |||
| Klebsiella planticola → Raoultella planticola | |||
| Klebsiella pneumoniae subsp. ozaenae (Klebsiella ozaenae) | 2 | ||
| Klebsiella pneumoniae subsp. pneumoniae (Klebsiella pneumoniae) | 2 | TA, ht | |
| Klebsiella pneumoniae subsp. rhinoscleromatis (Klebsiella rhinoscleromatis) | 2 | ||
| Klebsiella pneumoniae → Klebsiella pneumoniae subsp. pneumoniae | |||
| Klebsiella quasipneumoniae subsp. quasipneumoniae | 2 | neu | |
| Klebsiella quasipneumoniae subsp. similipneumoniae | 2 | ht | neu |
| Klebsiella rhinoscleromatis → Klebsiella pneumoniae subsp. rhinoscleromatis | |||
| Klebsiella singaporensis | 1 | ||
| Klebsiella singaporensis – synonym: Klebsiella variicola | Umb. | ||
| Klebsiella terrigena → Raoultella terrigena | |||
| Klebsiella trevisanii – synonym: Klebsiella planticola → Raoultella planticola | |||
| Klebsiella variicola | 2 | ht | |
| Klugiella | |||
| Klugiella xanthotipulae | 1 | ||
| Kluyvera | |||
| Kluyvera ascorbata | 2 | ||
| Kluyvera cochleae – synonym: Kluyvera intermedia | |||
| Kluyvera cryocrescens | 2 | ||
| Kluyvera georgiana | 1 | ||
| Kluyvera intermedia (Enterobacter intermedius) | 2 | ||
| Knoellia | |||
| Knoellia aerolata | 1 | ||
| Knoellia flava | 1 | ||
| Knoellia locipacati | 1 | ||
| Knoellia sinensis | 1 | ||
| Knoellia subterranea | 1 | ||
| Kocuria | |||
| Kocuria aegyptia | 1 | ||
| Kocuria arsenatis | 1 | neu | |
| Kocuria atrinae | 1 | ||
| Kocuria carniphila | 1 | ||
| Kocuria dechangensis | 1 | neu | |
| Kocuria erythromyxa – synonym: Kocuria rosea | |||
| Kocuria flava | 1 | ||
| Kocuria gwangalliensis | 1 | ||
| Kocuria halotolerans | 1 | ||
| Kocuria himachalensis | 1 | ||
| Kocuria indica | 1 | ||
| Kocuria koreensis | 1 | ||
| Kocuria kristinae (Micrococcus kristinae) | 1 | + | |
| Kocuria marina | 1 | ||
| Kocuria oceani | 1 | neu | |
| Kocuria palustris | 1 | ||
| Kocuria pelophila | 1 | neu | |
| Kocuria polaris | 1 | ||
| Kocuria rhizophila | 1 | ||
| Kocuria rosea (Micrococcus roseus) | 1 | ||
| Kocuria salina | 1 | neu | |
| Kocuria salsicia | 1 | ||
| Kocuria subflava | 1 | neu | |
| Kocuria turfanensis | 1 | ||
| Kocuria varians (Micrococcus varians) | 1 | ||
| Kofleria | |||
| Kofleria flava | 1 | ||
| Komagataeibacter | |||
| Komagataeibacter europaeus (Gluconacetobacter europaeus, Acetobacter europaeus) | 1 | ||
| Komagataeibacter hansenii (Gluconacetobacter hansenii, Acetobacter hansenii) | 1 | ||
| Komagataeibacter intermedius (Gluconacetobacter intermedius, Acetobacter intermedius) | 1 | ||
| Komagataeibacter kakiaceti (Gluconacetobacter kakiaceti) | 1 | ||
| Komagataeibacter kombuchae (Gluconacetobacter kombuchae, Gluconacetobacter hansenii) | 1 | ||
| Komagataeibacter maltaceti (Gluconacetobacter maltaceti) | 1 | ||
| Komagataeibacter medellinensis (Gluconacetobacter medellinensis) | 1 | ||
| Komagataeibacter nataicola (Gluconacetobacter nataicola) | 1 | ||
| Komagataeibacter oboediens (Gluconacetobacter oboediens, Acetobacter oboediens) | 1 | ||
| Komagataeibacter rhaeticus (Gluconacetobacter rhaeticus) | 1 | ||
| Komagataeibacter saccharivorans (Gluconacetobacter saccharivorans) | 1 | ||
| Komagataeibacter sucrofermentans (Gluconacetobacter sucrofermentans, Acetobacter xylinus subsp. sucrofermentans, Gluconacetobacter xylinus subsp. sucrofermentans) | 1 | ||
| Komagataeibacter swingsii (Gluconacetobacter swingsii) | 1 | ||
| Komagataeibacter xylinus (Gluconacetobacter xylinus, Acetobacter aceti subsp. xylinus, Acetobacter xylinus subsp. xylinus, Gluconacetobacter xylinus subsp. xylinus) | 1 | ||
| Kordia | |||
| Kordia algicida | 1 | ||
| Kordia antarctica | 1 | ||
| Kordia aquimaris | 1 | ||
| Kordia jejudonensis | 1 | ||
| Kordia periserrulae | 1 | ||
| Kordia ulvae | 1 | neu | |
| Kordia zhangzhouensis | 1 | neu | |
| Kordia zosterae | 1 | neu | |
| Kordiimonas | |||
| Kordiimonas aestuarii | 1 | ||
| Kordiimonas aquimaris | 1 | ||
| Kordiimonas gwangyangensis | 1 | ||
| Kordiimonas lacus | 1 | ||
| Kordiimonas lipolytica | 1 | neu | |
| Kordiimonas sediminis | 1 | neu | |
| Koreibacter – synonym: Paraoerskovia | |||
| Koreibacter algae – synonym: Paraoerskovia marina | |||
| Kosakonia | |||
| Kosakonia arachidis (Enterobacter arachidis) | 1 | ||
| Kosakonia cowanii (Enterobacter cowanii) | 2 | ||
| Kosakonia oryzae (Enterobacter oryzae) | 1 | ||
| Kosakonia oryzendophytica (Enterobacter oryzendophyticus) | 1 | Umb. | |
| Kosakonia oryziphila (Enterobacter oryziphilus) | 1 | Umb. | |
| Kosakonia radicincitans (Enterobacter radicincitans) | 1 | ||
| Kosakonia sacchari (Enterobacter sacchari) | 1 | Umb. | |
| Koserella | |||
| Koserella trabulsii | 2 | ||
| Kosmotoga | |||
| Kosmotoga arenicorallina | 1 | ||
| Kosmotoga olearia | 1 | ||
| Kosmotoga pacifica | 1 | neu | |
| Kosmotoga shengliensis (Thermococcoides shengliensis) | 1 | ||
| Kozakia | |||
| Kozakia baliensis | 1 | ||
| Krasilnikovia | |||
| Krasilnikovia cinnamomea | 1 | ||
| Krasilnikoviella | |||
| Krasilnikoviella flava (Promicromonospora flava) | 1 | Umb. | |
| Krasilnikoviella muralis | 1 | neu | |
| Kribbella | |||
| Kribbella alba | 1 | ||
| Kribbella albertanoniae | 1 | ||
| Kribbella aluminosa | 1 | ||
| Kribbella amoyensis | 1 | ||
| Kribbella antibiotica | 1 | ||
| Kribbella catacumbae | 1 | ||
| Kribbella deserti | 1 | neu | |
| Kribbella endophytica | 1 | ||
| Kribbella flavida | 1 | ||
| Kribbella ginsengisoli | 1 | ||
| Kribbella hippodromi | 1 | ||
| Kribbella italica | 1 | neu | |
| Kribbella jejuensis | 1 | ||
| Kribbella karoonensis | 1 | ||
| Kribbella koreensis (Hongia koreensis) | 1 | ||
| Kribbella lupini | 1 | ||
| Kribbella mirabilis | 1 | neu | |
| Kribbella pittospori | 1 | neu | |
| Kribbella qitaiheensis | 1 | neu | |
| Kribbella sancticallisti | 1 | ||
| Kribbella sandramycini | 1 | ||
| Kribbella shirazensis | 1 | ||
| Kribbella solani | 1 | ||
| Kribbella soli | 1 | neu | |
| Kribbella swartbergensis | 1 | ||
| Kribbella yunnanensis | 1 | ||
| Kribbia | |||
| Kribbia dieselivorans | 1 | ||
| Kriegella | |||
| Kriegella aquimaris | 1 | ||
| Krokinobacter → Dokdonia | |||
| Krokinobacter diaphorus → Dokdonia diaphoros | |||
| Krokinobacter eikastus → Dokdonia eikasta | |||
| Krokinobacter genikus → Dokdonia genika | |||
| Kroppenstedtia | |||
| Kroppenstedtia eburnea | 1 | + | |
| Kroppenstedtia guangzhouensis | 1 | ||
| Kroppenstedtia pulmonis | 1 | + | neu |
| Kroppenstedtia sanguinis | 1 | + | neu |
| Ktedonobacter [Ktedobacter] | |||
| Ktedonobacter [Ktedobacter] racemifer | 1 | ||
| Kurthia | |||
| Kurthia gibsonii | 1 | + | |
| Kurthia huakuii | 1 | ||
| Kurthia massiliensis | 1 | ||
| Kurthia populi | 1 | p+ | neu |
| Kurthia senegalensis | 1 | neu | |
| Kurthia sibirica | 1 | ||
| Kurthia zopfii | 1 | + | |
| Kushneria | |||
| Kushneria aurantia | 1 | ||
| Kushneria avicenniae (Halomonas avicenniae) | 1 | ||
| Kushneria indalinina (Halomonas indalinina) | 1 | ||
| Kushneria konosiri | 1 | neu | |
| Kushneria marisflavi (Halomonas marisflavi) | 1 | ||
| Kushneria pakistanensis | 1 | neu | |
| Kushneria sinocarnis | 1 | ||
| Kutzneria | |||
| Kutzneria albida (Streptosporangium albidum) | 1 | ||
| Kutzneria buriramensis | 1 | ||
| Kutzneria chonburiensis | 1 | neu | |
| Kutzneria kofuensis (Streptosporangium viridogriseum subsp. kofuense) | 1 | ||
| Kutzneria viridogrisea (Streptosporangium viridogriseum subsp. viridogriseum) | 1 | ||
| Kyrpidia | |||
| Kyrpidia tusciae (Bacillus tusciae) | 1 | ||
| Kytococcus | |||
| Kytococcus aerolatus | 1 | ||
| Kytococcus schroeteri | 1 | + | |
| Kytococcus sedentarius (Micrococcus sedentarius) | 1 | + |