Tuesday, 3 June 2014


What are bacteria? List down some characteristics of bacteria

Bacteria are tiny single-cell microorganisms, usually a few micrometers in length that normally exist together in millions.
They come in 3 main shapes:
  • Spiral 

  • Rod

  • Sphere

How to identify bacteria?

  • Gram Staining
  • Ziehl-Neelsen Staining.
  • Genetic testing

Name 3 common bacteria and places where they are commonly found.

Staphylococcus epidermidis 
most frequent organism found in the blood of bone marrow transplant patients and on central venous catheters for patients of total parenteral nutrition
Vibrio cholerae
The cholera bacterium is usually found in water or food sources that have been contaminated by feces from a person infected with cholera. Cholera is most likely to be found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene.

Are all bacteria harmful to humans? if not, list down some species.

No, Lactobacillus, Bifidobacterium and Bifidobacterium are not harmful to the human body.

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