bile solubility test

(for differentiation of pneumococci from other streptococci) a sample of a broth culture is incubated at pH 7.4 to 7.6 with sodium deoxycholate. A decrease in turbidity (positive test) indicates lysing of the cells. Pneumococci give a positive result, whereas other viridans streptococci give a negative one.

Medical dictionary. 2011.

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