# List of clinically important bacteria

This is a list of bacteria that are significant in medicine. For viruses, see list of viruses.
* Top
* 0–9
* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z

## A

* Acetobacter aurantius
* Acinetobacter baumannii
* Actinomyces israelii
* Agrobacterium radiobacter
* Agrobacterium tumefaciens
* Anaplasma
** Anaplasma phagocytophilum
* Azorhizobium caulinodans
* Azotobacter vinelandii
* viridans streptococci

## B

* Bacillus
** Bacillus anthracis
** Bacillus brevis
** Bacillus cereus
** Bacillus fusiformis
** Bacillus licheniformis
** Bacillus megaterium
** Bacillus mycoides
** Bacillus stearothermophilus
** Bacillus subtilis
** Bacillus thuringiensis
* Bacteroides
** Bacteroides fragilis
** Bacteroides gingivalis
** Bacteroides melaninogenicus (now known as Prevotella melaninogenica)
* Bartonella
** Bartonella henselae
** Bartonella quintana
* Bordetella
** Bordetella bronchiseptica
** Bordetella pertussis
* Borrelia burgdorferi
* Brucella
** Brucella abortus
** Brucella melitensis
** Brucella suis
* Burkholderia
** Burkholderia mallei
** Burkholderia pseudomallei
** Burkholderia cepacia

## C

* Calymmatobacterium granulomatis
* Campylobacter
** Campylobacter coli
** Campylobacter fetus
** Campylobacter jejuni
** Campylobacter pylori
* Capnocytophaga canimorsus
* Chlamydia
** Chlamydia trachomatis
* Chlamydophila
** Chlamydophila pneumoniae (previously called Chlamydia pneumoniae)
** Chlamydophila psittaci (previously called Chlamydia psittaci)
* Citrobacter
** Citrobacter freundii
** Citrobacter koseri
* Clostridioides difficile
* Clostridium
** Clostridium botulinum
** Clostridium perfringens (previously called Clostridium welchii)
** Clostridium tetani
* Corynebacterium
** Corynebacterium diphtheriae
** Corynebacterium fusiforme
* Coxiella burnetii
* Cutibacterium acnes (previously called Propionibacterium acnes)

## E

* Ehrlichia chaffeensis
* Ehrlichia ewingii
* Eikenella corrodens
* Enterobacter cloacae
* Enterococcus
** Enterococcus avium
** Enterococcus casseliflavus
** Enterococcus durans
** Enterococcus faecalis
** Enterococcus faecium
** Enterococcus gallinarum
** Enterococcus maloratus
* Escherichia coli

## F

* Francisella tularensis (previously called Pasteurella tularensis)
* Fusobacterium necrophorum
* Fusobacterium nucleatum

## G

* Gardnerella vaginalis

## H

* Haemophilus
** Haemophilus ducreyi
** Haemophilus influenzae
** Haemophilus parainfluenzae
** Haemophilus pertussis
** Haemophilus vaginalis
* Helicobacter pylori

## K

* Kingella kingae
* Klebsiella
** Klebsiella granulomatis
** Klebsiella pneumoniae

## L

* Lactobacillus
** Lactobacillus acidophilus
** Lactobacillus bulgaricus
** Lactobacillus casei
** Lactococcus lactis
* Legionella pneumophila
* Leptospira interrogans
* Leptospira noguchii
* Listeria monocytogenes

## M

* Methanobacterium extroquens
* Microbacterium multiforme
* Micrococcus luteus
* Moraxella catarrhalis
* Morganella morganii
* Mycobacterium
** Mycobacterium avium
** Mycobacterium bovis
** Mycobacterium diphtheriae
** Mycobacterium intracellulare
** Mycobacterium leprae
** Mycobacterium lepraemurium
** Mycobacterium phlei
** Mycobacterium smegmatis
** Mycobacterium tuberculosis
* Mycoplasma
** Mycoplasma fermentans
** Mycoplasma genitalium
** Mycoplasma hominis
** Mycoplasma penetrans
** Mycoplasma pneumoniae
** Mycoplasma mexican

## N

* Neisseria
** Neisseria gonorrhoeae
** Neisseria meningitidis
* Nocardia
** Nocardia asteroides
** Nocardia brasiliensis
** Nocardia cyriacigeorgica
** Nocardia farcinica

## P

* Pasteurella multocida
* Peptostreptococcus
* Porphyromonas gingivalis
* Prevotella melaninogenica (previously called Bacteroides melaninogenicus)
* Proteus
** Proteus mirabilis
** Proteus penneri
** Proteus vulgaris
* Pseudomonas aeruginosa

## R

* Rhizobium radiobacter
* Rickettsia
** Rickettsia prowazekii
** Rickettsia psittaci
** Rickettsia quintana
** Rickettsia rickettsii
** Rickettsia trachomae
* Rochalimaea
** Rochalimaea henselae
** Rochalimaea quintana
* Rothia dentocariosa

## S

* Salmonella
** Salmonella enteritidis
** Salmonella typhi
** Salmonella typhimurium
* Serratia marcescens
* Shigella dysenteriae
* Spirillum volutans
* Staphylococcus
** Staphylococcus aureus
** Staphylococcus epidermidis
* Stenotrophomonas maltophilia
* Streptococcus
** Streptococcus agalactiae
** Streptococcus anginosus
** Streptococcus avium
** Streptococcus bovis
** Streptococcus constellatus
** Streptococcus cricetus
** Streptococcus ferus
** Streptococcus intermedius
** Streptococcus lactis
** Streptococcus mitior
** Streptococcus mitis
** Streptococcus mutans
** Streptococcus oralis
** Streptococcus pneumoniae
** Streptococcus pyogenes
** Streptococcus rattus
** Streptococcus salivarius
** Streptococcus sanguis
** Streptococcus sobrinus
** Streptomyces avermitilis

## U

* Ureaplasma urealyticum

## V

* Vibrio
** Vibrio cholerae
** Vibrio comma
** Vibrio parahaemolyticus
** Vibrio vulnificus

## W

* Wolbachia

## Y

* Yersinia
** Yersinia enterocolitica
** Yersinia pestis
** Yersinia pseudotuberculosis