The ethylhydrocupreine HCl susceptibility test is a presumptive test for the identification of which organism?

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Multiple Choice

The ethylhydrocupreine HCl susceptibility test is a presumptive test for the identification of which organism?

Explanation:
Optochin susceptibility is used to distinguish Streptococcus pneumoniae from viridans group streptococci. The ethylhydrocupreine HCl disk inhibits the growth of S. pneumoniae, producing a clear zone of inhibition around the disk, whereas most viridans streptococci resist optochin and grow right up to the disk. This makes the test a helpful presumptive identifier for S. pneumoniae among alpha-hemolytic cocci. The other organisms listed do not show this distinct sensitivity pattern, so they are not identified by this test.

Optochin susceptibility is used to distinguish Streptococcus pneumoniae from viridans group streptococci. The ethylhydrocupreine HCl disk inhibits the growth of S. pneumoniae, producing a clear zone of inhibition around the disk, whereas most viridans streptococci resist optochin and grow right up to the disk. This makes the test a helpful presumptive identifier for S. pneumoniae among alpha-hemolytic cocci. The other organisms listed do not show this distinct sensitivity pattern, so they are not identified by this test.

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