Solubility in the presence of sodium desoxycholate is characteristic of which organism?

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Multiple Choice

Solubility in the presence of sodium desoxycholate is characteristic of which organism?

Explanation:
Bile solubility is a diagnostic feature that helps differentiate Streptococcus pneumoniae from other similar bacteria. In S. pneumoniae, exposure to sodium deoxycholate activates autolysins in the cell wall, causing rapid lysis and dissolution of the colonies. This results in a clear, soluble appearance of the culture. The other organisms listed do not undergo this autolysis in bile salts, so their colonies stay intact. Therefore, solubility in sodium deoxycholate points to Streptococcus pneumoniae.

Bile solubility is a diagnostic feature that helps differentiate Streptococcus pneumoniae from other similar bacteria. In S. pneumoniae, exposure to sodium deoxycholate activates autolysins in the cell wall, causing rapid lysis and dissolution of the colonies. This results in a clear, soluble appearance of the culture. The other organisms listed do not undergo this autolysis in bile salts, so their colonies stay intact. Therefore, solubility in sodium deoxycholate points to Streptococcus pneumoniae.

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