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Morphology Of Bacteria


A. Shape of bacteria

  1. Cocci: staphylococci, streptococci
  2. Bacilli: salmonella, E. coli, corynebacterium
  3. Vibrio: comma shaped; vibrio cholerae
  4. Spirilla: non flexuous spiral forms eg.:  spirillum minus
  5. Spirochetes: slender, flexuous: treponema, leptospira
  6. Actinomycetes (branching, filamentous rods)
  7. Mycoplasma: cell wall deficient bacteria, no definite shape  

B. Group patterns

  1. Diplococci (N. gonorrhoeae, Moraxella catarrhalis)
  2. Chains (S. pyogenes) /streptobacilli (S. moniliformis)
  3. Tetrads (Micrococci)
  4. Octads (Sarcina)
  5. Cluster (S. aureus)
  6. Cuneiform/ Chinese letter pattern (C. diphtheriae)

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