Pathogenic Bacteria - List of Pathogenic Bacteria By Basic Laboratory Characteristics

List of Pathogenic Bacteria By Basic Laboratory Characteristics

Following are the genera that contain the most important human pathogenic bacteria species:

Genus Important species Gram staining Shape Capsulation Bonding tendency Motility Respiration Growth medium Intra/Extracellular
Bordetella
  • Bordetella pertussis
Gram-negative Small coccobacilli Encapsulated singly or in pairs aerobic Regan-Lowe agar extracellular
Borrelia
  • Borrelia burgdorferi
Gram-negative, but stains poorly spirochete Long, slender, flexible, spiral- or corkscrew-shaped rods highly motile anaerobic (difficult to culture) extracellular
Brucella
  • Brucella abortus
  • Brucella canis
  • Brucella melitensis
  • Brucella suis
Gram-negative Small coccobacilli Unencapsulated singly or in pairs non-motile aerobic Blood agar intracellular
Campylobacter
  • Campylobacter jejuni
Gram-negative Curved, spiral, or S-shaped
bacilli with single, polar flagellum
Unencapsulated Singly characteristic darting motion microaerophilic Blood agar inhibiting other fecal flora extracellular
Chlamydia and Chlamydophila
  • Chlamydia pneumoniae
  • Chlamydia trachomatis
  • Chlamydophila psittaci
(not Gram-stained) Small, round, ovoid Unencapsulated motile Facultative or strictly aerobic Obligate intracellular
Clostridium
  • Clostridium botulinum
  • Clostridium difficile
  • Clostridium perfringens
  • Clostridium tetani
Gram-positive Large, blunt-ended rods Normally encapsulated mostly motile Obligate anaerobic Anaerobic blood agar extracellular
Corynebacterium
  • Corynebacterium diphtheriae
Gram-positive (unevenly) Small, slender, pleomorphic rods Unencapsulated clumps looking like Chinese characters or a picket fence nonmotile Mostly facultative anaerobic Aerobically on Tinsdale agar extracellular
Enterococcus
  • Enterococcus faecalis
  • Enterococcus faecium
Gram-positive Round to ovoid (cocci) pairs or chains Non-motile Facultative Anaerobic 6.5% NaCl, bile-esculin agar extracellular
Escherichia
  • Escherichia coli
Gram-negative Short rods (bacilli) Encapsulated and Unencapsulated Normally motile Facultative anaerobic MacConkey agar extracellular or intracellular
Francisella
  • Francisella tularensis
Gram-negative Small, pleomorphic coccobacillus Encapsulated Non-motile strictly aerobic (rarely cultured) Facultative intracellular
Haemophilus
  • Haemophilus influenzae
Gram-negative Ranging from small coccobacillus to long, slender filaments Encapsulated or Unencapsulated Non-motile Chocolate agar with hemin and NAD+ extracellular
Helicobacter
  • Helicobacter pylori
Gram-negative Curved or spiral rods
pultiple polar flagella
rapid, corkscrew motility Microaerophile Medium containing antibiotics against other fecal flora extracellular
Legionella
  • Legionella pneumophila
Gram-negative, but stains poorly Slender rod in nature, cocobacillary in laboratory.
monotrichious flagella
unencapsulated motile aerobic Specialized medium facultative intracellular
Leptospira
  • Leptospira interrogans
Gram-negative, but stains poorly Long, very slender, flexible, spiral- or corkscrew-shaped rods Highly motile Strictly aerobic Specialized medium extracellular
Listeria
  • Listeria monocytogenes
Gram-positive, darkly Slender, short rods diplobacilli or short chains Distinct tumbling motility in liquid medium Facultative Anaerobic enriched medium intracellular
Mycobacterium
  • Mycobacterium leprae
  • Mycobacterium tuberculosis
  • Mycobacterium ulcerans
(none) Long, slender rods Unencapsulated nonmotile aerobic M. tuberculosis: Lowenstein-Jensen agar
M. leprae: (none)
extracellular
Mycoplasma
  • Mycoplasma pneumoniae
(none) Plastic, pleomorphic Encapsulated singly or in pairs Mostly facultative anaerobic; M.pneumoniae strictly aerobic (rarely cultured) extracellular
Neisseria
  • Neisseria gonorrhoeae
  • Neisseria meningitidis
Gram-negative Kidney bean-shaped Encapsulated or Unencapsulated diplococci Non-motile aerobic Thayer-Martin agar Gonococcus: facultative intracellular
N. meningitidis
: extracellular
Pseudomonas
  • Pseudomonas aeruginosa
Gram-negative rods encapsulated motile Obligate aerobic MacConkey agar extracellular
Rickettsia
  • Rickettsia rickettsii
Gram-negative, but stains poorly Small, rod-like coccobacillary Slime/microcapsule Non-motile Aerobic (rarely cultured) Obligate intracellular
Salmonella
  • Salmonella typhi
  • Salmonella typhimurium
Gram-negative Bacilli Encapsulated Normally motile Facultative anaerobic MacConkey agar Facultative intracellular
Shigella
  • Shigella sonnei
Gram-negative rods Unencapsulated Non-motile Facultative anaerobic Hektoen agar extracellular
Staphylococcus
  • Staphylococcus aureus
  • Staphylococcus epidermidis
  • Staphylococcus saprophyticus
Gram-positive, darkly Round cocci Encapsulated or Unencapsulated in bunches like grapes Non-motile Facultative anaerobic enriched medium (broth and/or blood) extracellular
Streptococcus
  • Streptococcus agalactiae
  • Streptococcus pneumoniae
  • Streptococcus pyogenes
Gram-positive ovoid to spherical Encapsulated or Unencapsulated pairs or chains nonmotile Facultative anaerobic blood agar extracellular
Treponema
  • Treponema pallidum
Gram-negative, but stains poorly Long, slender, flexible, spiral- or corkscrew-shaped rods highly motile Aerobic none extracellular
Vibrio
  • Vibrio cholerae
Gram-negative Short, curved, rod-shaped with single polar flagellum Unencapsulated rapidly motile Facultative anaerobic blood- or MacConkey agar. Stimulated by NaCl extracellular
Yersinia
  • Yersinia pestis
Gram-negative, stains bipolarly Small rods encapsulated nonmotile Facultative Anaerobe MacConkey or CIN agar Intracellular

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