Cocci Bacteria

Cocci

Cocci may be gram positive or gram negative bacteria. It is spherical or rounded structure.

Classification: Two types-

     1.Gram positive                                             2.Gram negative

Gram positive two types:                        Gram negative two types:

1.Cluster forming                                                1.Aerodic

2.Chain or pair forming                                       2.Anaerobic

General character:

  1.Shape:Rounded or spherical

  2.Size:Usually I µm in diameter.

 3.Arrange:Cluster form (staphylococci).or in pair (pneumococci)or short chain (streptococci)

  4.Capsule:Some strain are capsulated and some are non-capsulated.

  5.Flagella:Non-flagellated.

  6.Spore:Non –sporing.

  7.Motility:Non –motile.

  8.Growth:Grow on ordinary media but some require special media.

  9.Pathogenecity:Most of them pathogenic, some are non pathogenic

 10.Types :Most of the cocci are aerobic but some are anaerobic.