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Photo Gallery of Bacterial Pathogens

The web contains many images (pictures) of bacteria. The purpose of this page is to provide a central location to go to for images of pathogenic bacteria on the web. Most of the images are not mine. Please refer to the url in your location window of your browser to obtain information on the images' owner(s). This webpage is always in need of suggestions and if you know of other great locations for images email me at nchamberlain@atsu.edu. Another very useful webpage with links to lots of bacterial images can be found at The Virtual Museum of Bacteria. Images of viruses or fungi click on the words.

Gram Positive Organisms

Aerobic, Gram-positive cocci

  • Staphylococcus aureus (fig 1, 2)
  • Staphylococcus epidermidis (fig 1, 2)
  • Staphylococcus sp. (Coagulase-negative)(fig 1)
  • Streptococcus pneumoniae (Viridans group)(fig 1, 2, 3)
  • Streptococcus agalactiae (group B)(fig 1, 2; CAMP test; fig 1)
  • Streptococcus pyogenes (group A)(fig 1) Bacitracin inhibition fig 2)
  • Enterococcus sp.(fig 1, 2)

Aerobic, Gram-positive rods

  • Bacillus anthracis (fig 1, 2)
  • Bacillus cereus (fig 1, 2)
  • Bifidobacterium bifidum (fig 1)
  • Lactobacillus sp. (fig 1, 2)
  • Listeria monocytogenes (fig 1, 2)
  • Nocardia sp.(fig 1, 2)
  • Rhodococcus equi (coccobacillus)(fig 1)
  • Erysipelothrix rhusiopathiae (fig1)
  • Corynebacterium diptheriae (fig 1, 2)

Anaerobic, Gram-positive rods

  • Actinomyces sp. (fig 1)
  • Clostridium botulinum (fig 1)
  • Clostridium difficile (fig 1, 2 )
  • Clostridium perfringens (fig 1)
  • Clostridium tetani (fig 1)
  • Mobiluncus sp.(gram-variable or gram-negative but has a gram-positive cell wall; fig. 1)
  • Propionibacterium acnes (fig 1)(an aerotolerant anaerobe)

Anaerobic, Gram-positive cocci

  • Peptostreptococcus sp. (fig 1)

Gram Negative Organisms

Aerobic, Gram-negative cocci

  • Neisseria gonorrhoeae (fig 1)
  • Neisseria meningitidis (fig 1)
  • Moraxella catarrhalis (fig 1)

Anaerobic, Gram-negative cocci

  • Veillonella sp. (fig 1)

Aerobic, Gram-negative rods

  • Fastidious, Gram-negative rods
    • Actinobacillus actinomycetemcomitans (new name Aggregatibacter actinomycetemcomitans fig 1)
    • Acinetobacter baumannii(fig 1 really A. calcoaceticus)
    • Bordetella pertussis (fig 1)
    • Brucella sp. (fig 1)
    • Campylobacter sp.(fig 1, 2)
    • Capnocytophaga sp.(fig 1)
    • Cardiobacterium hominis (fig 1)
    • Eikenella corrodens (fig 1)
    • Francisella tularensis (fig 1)
    • Haemophilus ducreyi (fig 1, 2)
    • Haemophilus influenzae (fig 1)
    • Helicobacter pylori (fig 1, 2, 3)
    • Kingella kingae (fig 1)
    • Legionella pneumophila (fig 1, 2)
    • Pasteurella multocida (fig 1)
    • Klebsiella granulomatis (formerly called Calymmatobacterium granulomatis (Gram negative rod)(fig 1)
  • Enterobacteriaceae (glucose and lactose        fermenting Gram-negative rods)
    • Citrobacter sp. (fig 1)
    • Enterobacter sp. (fig 1)
    • Escherichia coli (fig 1)
    • Klebsiella pneumoniae (fig 1)
  • Fermenting glucose but NOT lactose; Gram-negative rods
    • Proteus sp. (fig 1)
    • Salmonella enteriditis (fig 1)
    • Salmonella typhi (fig 1)
    • Shigella sp. (fig 1)
    • Serratia marcescens (fig 1, 2)
    • Yersinia enterocolitica (fig 1)
    • Yersinia pestis (fig 1)
  • Oxidase-positive, glucose-fermenting Gram-negative rods
    • Aeromonas sp. (fig 1)
    • Plesiomonas shigelloides (fig 1)
    • Vibrio cholerae (fig 1)
    • Vibrio parahaemolyticus (fig 1)
    • Vibrio vulnificus (fig 1, 2)
  • Glucose-nonfermenting, Gram-negative rods
    • Acinetobacter sp. (fig 1)
    • Flavobacterium sp. (fig 1)
    • Pseudomonas aeruginosa (fig 1)
    • Burkholderia cepacia (fig 1)
    • Burkholderia pseudomallei (fig 1)
    • Xanthomonas maltophilia or Stenotrophomonas maltophila (fig 1)

Anaerobic, Gram-negative rods

  • Bacteroides fragilis (fig 1, 2)
  • Prevotella sp. (fig 1)
  • Fusobacterium sp. (fig 1)

Gram-negative rod (spiral)

Spirillum minus (minor) (fig 1)

Bacteria which cannot or are difficult to Gram stain

Borrelia burgdorferi (fig 1, 2)

Borrelia recurrentis (fig 1)

Bartonella henselae (fig 1)

Chlamydia trachomatis (fig 1, 2)

Chlamydophila pneumoniae (fig 1, 2)

Chlamydophila psittaci (1)

Coxiella burnetii (fig 1)

Ehrlichia chaffeensis (fig 1, 2)

Ehrlichia ewingii (Fig 1, 2)

Anaplasma phagocytophilum (formerly; Ehrlichia phagocytophilum or E. equi; Fig. 1, 2)

Leptospira sp.(fig 1)

Mycobacterium bovis (fig 1)

Mycobacterium tuberculosis (fig 1, 2)

Mycobacterium avium, Mycobacterium intracellulare (fig 1 thanks to Anders Olav Lande)

Mycobacterium kansasii (fig 1)

Mycobacterium leprae (fig 1)

Mycobacterium marinum (fig 1)

Rickettsia rickettsii (Fig. 1)

Orientia tsutsugamushi (formerly; Rickettsia tsutsugamushi; Fig. 1)

Treponema pallidum (fig 1, 2)

A virologist has produced a wonderful site called the Big Picture Book of Viruses. The the mycologists created Mycology Online.  

! Important Notice ! The links on these pages take you to different URLs and all copyrights are owned by the photographers at those urls. They have done great work! Visit their homepages to learn more.  

(Last Revised 8/7/13)

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