Which of the following produces beta heamolytic colonies when cultured in blood agar media?

Corynebacterium

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Streptococcus

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Pneumococcus

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Pseudomonas

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Solution

The correct option is B Streptococcus
Streptococcus is a Gram-positive bacteria belonging to the phylum Firmicutes. Beta hemolysis is a complete lysis of red cells in blood agar media (whose main component is blood) around and under the colonies due to which that area appears lightened (yellow) and transparent. This is brought about by streptolysin, an exotoxin produced by the bacteria that causes lysis of red blood cells. Thus, the correct answer is option B.

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