Which of the following tests are used to differentiate between these bacteria:
Tests: Bacitracin Test, SXT Test, CAMP Test, Enterococcosel Agar, 6.5% NaCl Test and Optochin Test
A) Streptococcus viridans and Streptococcus faecalis
B) Group A and Group B Streptococci
C) Group B and viridans group of streptococci
D) Pneumococci and viridans group of Streptococci
E) Group A from Group C streptococci if both organisms are bacitracin susceptible
F) S. pneumoniae from other alpha hemolytic streptococci
I think that letter B is the CAMP test, and letter D is the optochin test, and E is the SXT test. If someone could just let me know if those three are correct and help me with the ones that I don't have an answer to I would REALLY appreciate it. Thanks!!
Yes, you are correct about the CAMP test for option B, the Optochin test for option D, and the SXT test for option E. Let's now go through the remaining options:
A) Streptococcus viridans and Streptococcus faecalis:
To differentiate between these bacteria, the 6.5% NaCl Test can be used. Streptococcus faecalis (Enterococcus) is able to grow in a high concentration of salt (6.5% NaCl) while Streptococcus viridans is not.
C) Group B and viridans group of streptococci:
The Bacitracin test is used to differentiate between Group B Streptococci (Streptococcus agalactiae) and the viridans group of streptococci. Group B Streptococci are resistant to Bacitracin, whereas the viridans group of streptococci is sensitive to Bacitracin.
F) S. pneumoniae from other alpha hemolytic streptococci:
The Optochin test is used to differentiate Streptococcus pneumoniae from other alpha-hemolytic streptococci. S. pneumoniae is susceptible to Optochin, while other alpha-hemolytic streptococci are resistant.
So, to summarize:
A) Streptococcus viridans and Streptococcus faecalis - 6.5% NaCl Test
B) Group A and Group B Streptococci - CAMP Test
C) Group B and viridans group of streptococci - Bacitracin Test
D) Pneumococci and viridans group of Streptococci - Optochin Test
E) Group A from Group C streptococci if both organisms are bacitracin susceptible - SXT Test
F) S. pneumoniae from other alpha hemolytic streptococci - Optochin Test
I hope this helps! Let me know if you have any further questions.