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Habitat of Streptococcus pneumoniae
- Streptococcus pneumoniae are found worldwide.
- Found in primates, livestock and felines.
- They are the part of normal flora of upper respiratory tract infection in humans.
- Mostly found in throat and nasal passage.
- They infection mostly children in winter seasons.
- They are Mesophilic, 30 to 35°C.
Morphology of Streptococcus pneumoniae
- They are gram positive bacteria.
- May lose gram +ve character in older cultures and appear gram –ve.
- They are non-sporing and non-motile bacteria.
- May have pili for adherence.
- They are 0.5 x 1.25 µm in diameter.
- They are mostly found in pairs (diplococci).
- Also found singly and in short chains isolated from body liquids.
- They are lancet-shaped or bullet-shaped.
- They are capsulated.
- Capsules has 90+ serotypes.
- They are alpha (α) hemolytic.
- They contains more than 500 different surface proteins.
Genomes of Streptococcus pneumoniae
- Single circular chromosome.
- 2 million base pair.
- GC Content: 39.7%.
- Codes for 1914 proteins and 73 RNA’s.