Habitat and Morphology of Shigella dysenteriae

Habitat and Morphology of Shigella dysenteriae

Habitat of Shigella dysenteriae

  1. They are found worldwide.
  2. Humans are only the natural host.
  3. They are also found in human intestinal tract.
  4. They are mostly found in the area where there is overcrowded.
  5. Prevalent in low waste management areas and no safe drinking water supply.
  6. Houseflies serves as vectors.
  7. They are also found in contaminated food and water.
  8. They causes endemic dysentery in Africa, Southeast Asia and Indian Sub-continent.
  9. Risk for day care ages (1-4 years) and elderly adults.
  10. Custodial (Housekeeping) are also at high risk of infection.
  11. They are spread by the fecal-oral route.

Morphology of Shigella dysenteriae

  1. They are gram -ve small rod shaped bacteria.
  2. They are non-capsulated.
  3. They are 2-4 µm long and 0.4-0.6 µm wide.
  4. They are non-sporing.
  5. They are non-acid fast bacteria.
  6. They have rounded ends.
  7. Around 15 serotypes are present.
  8. They are non-motile.

Genome (Sd17) of Shigella dysenteriae

  1. They have one circular chromosome.
  2. Number of nucleotides: 4,369,232
  3. Number of genes: 4664
  4. Plasmid: 182,726 nucleotides and 224 genes

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).

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