Disease caused by Streptococcus pneumoniae

Disease caused by Streptococcus pneumoniae

The Streptococcus pneumoniae is gram-positive lancet shape bacteria. It may be diplococcus or streptococcus. Pneumococcus is non-motile, non-spore forming capsulated bacteria. They may be aerobic or facultative anaerobic in nature. They are a normal inhabitant of human respiratory tract Pneumococcus bacteria may be an important cause of pneumonia, otitis, sinusitis, bronchitis, meningitis and other infection like arthritis, conjunctivitis and suppurative lesions.

Streptococcus pneumoniae
Streptococcus pneumoniae

1. Morphology

  • Pneumococci are lancet shape with one end broad or rounded and other end pointed
  • If they occur in pair called as diplococci.
  • They are smaller than 1 micrometre in size.
  • The capsule enclose each pair of cells. These capsules can be made visible by using capsule staining method.
  • These cells are readily stained by gram staining procedure.

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