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What is the name of the microorganism (genius, species) in this picture? It should be one...

What is the name of the microorganism (genius, species) in this picture? It should be one of these microorganisms (B. cereus, E. coli, P. aeruginosa, S. marcescens, S. aureus, S. epidermis).

Is it gram positive or negative? What is its shape and arrangement? Please provide brief information about this organism (what it does). Please type or write in clear handwriting.

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Answer #1

It is most probably Bacillus cereus.

It stained purple with Gram's staining so it is a Gram positive organism.

It is a rod shaped bacillus.

E.coli S.marcescenes and P.aeruginosa stain Pink. Hence they can be ruled out.

S.aureus and S.epidermis stain puple, but they appear oval or round. Hence they can be ruled out.

Bacillus cereus is present in the environment and soil. It is commonly known for contaminating food which is kept at room temperature for hours. Consuming B.cereus contaminated food causes vomiting and diarrhoea. This bacteria produces spores which are resistant to heat upto 100 degree celcius. Improper heating of food does not kill this bacteria.

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