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31 Examples of Microorganisms

September 18, 2023
written by Sidra Batool

Microorganisms are the organisms that can be seen with naked eye. They are also known as microscopic organisms. Bacteria, Viruses, Fungi, Protozoa are some examples of microorganisms.

image showing Examples of Microorganisms

Examples of Microorganisms

Here are 31 examples of microorganisms:


  1. Escherichia coli (E. coli)-Common gut bacteria, some strains are pathogenic.
  2. Streptococcus-Includes species responsible for strep throat.
  3. Mycobacterium tuberculosis-Causes tuberculosis (TB).
  4. Clostridium botulinum-Produces the toxin responsible for botulism.
  5. Salmonella-Known for causing food poisoning.
  6. Rhizobium-Forms symbiotic relationships with legumes, fixing nitrogen.
  7. Cyanobacteria-Photosynthetic bacteria also known as blue-green algae.
  8. Bacillus thuringiensis (Bt)-Used in biotechnology and organic farming for insect control.
  9. Lactobacillus-Found in yogurt and other fermented foods,
  10. Mycobacterium leprae-The bacterium responsible for causing leprosy (Hansen’s disease)


11. Methanogens-Produce methane in anaerobic environments.

12. Halophiles-live in extremely salty environments like the Dead Sea.

13. Thermophiles-Live in high-temperature environments, such as hot springs.


14. Saccharomyces cerevisiae-Baker’s yeast used in bread making.

15. Penicillium-Source of the antibiotic penicillin.

15. Aspergillus-Used in the production of citric acid and enzymes.

16. Candida albicans-Can cause yeast infections in humans.


17. Influenza virus-Responsible for seasonal flu outbreaks.

18. HIV (Human Immunodeficiency Virus)-Causes AIDS.

19. Herpes simplex virus-Causes oral and genital herpes.

20. Bacteriophage-Viruses that infect bacteria.

21. Adenovirus-Commonly causes respiratory illnesses.


22. Amoeba-A group of single-celled organisms that move by pseudopods.

23. Plasmodium-Causes malaria in humans.

24. Paramecium-Ciliated protozoa found in freshwater environments.

25. Giardia-A parasite responsible for giardiasis.


26. Chlorella-Used in food supplements and biofuel production.

27. Diatoms-Important phytoplankton in aquatic ecosystems.

28. Spirulina-Consumed as a nutrient-rich supplement.

Microscopic Animals

29. Rotifers-Tiny, multicellular animals found in freshwater.

30. Nematodes (Roundworms)-Common soil-dwelling organisms.

31. Tardigrades (Water Bears)-Resilient micro-animals known for surviving extreme conditions.

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