Habitat and Morphology of Streptococcus pneumoniae

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Habitat of Streptococcus pneumoniae

  1. Streptococcus pneumoniae are found worldwide.
  2. Found in primates, livestock and felines.
  3. They are the part of normal flora of upper respiratory tract infection in humans.
  4. Mostly found in throat and nasal passage.
  5. They infection mostly children in winter seasons.
  6. They are Mesophilic, 30 to 35°C.
Habitat and Morphology of Streptococcus pneumoniae

Morphology of Streptococcus pneumoniae

  1. They are gram positive bacteria.
  2. May lose gram +ve character in older cultures and appear gram –ve.
  3. They are non-sporing and non-motile bacteria.
  4. May have pili for adherence.
  5. They are 0.5 x 1.25 µm in diameter.
  6. They are mostly found in pairs (diplococci).
  7. Also found singly and in short chains isolated from body liquids.
  8. They are lancet-shaped or bullet-shaped.
  9. They are capsulated.
  10. Capsules has 90+ serotypes.
  11. They are alpha (α) hemolytic.
  12. They contains more than 500 different surface proteins.
Morphology of Streptococcus pneumoniae
Figure: Morphology of Streptococcus pneumonia. Source: CDC.

Genomes of Streptococcus pneumoniae

  1. Single circular chromosome.
  2. 2 million base pair.
  3. GC Content: 39.7%.
  4. Codes for 1914 proteins and 73 RNA’s.

About Author

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Sagar Aryal

Sagar Aryal is a microbiologist and a scientific blogger. He is doing his Ph.D. at the Central Department of Microbiology, Tribhuvan University, Kathmandu, Nepal. He was awarded the DAAD Research Grant to conduct part of his Ph.D. research work for two years (2019-2021) at Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Saarbrucken, Germany. Sagar is interested in research on actinobacteria, myxobacteria, and natural products. He is the Research Head of the Department of Natural Products, Kathmandu Research Institute for Biological Sciences (KRIBS), Lalitpur, Nepal. Sagar has more than ten years of experience in blogging, content writing, and SEO. Sagar was awarded the SfAM Communications Award 2015: Professional Communicator Category from the Society for Applied Microbiology (Now: Applied Microbiology International), Cambridge, United Kingdom (UK). Sagar is also the ASM Young Ambassador to Nepal for the American Society for Microbiology since 2023 onwards.

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