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Health, Medicine, Nursing
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Topic:

Streptococci, Pneumococci, and Enterococci

Essay Instructions:

Week 8 –
Exercise 4 – Streptococci, Pneumococci, and Enterococci
1. Differentiate the microscopic morphology of streptococci and pneumococci as seen by Gram stain.
2. What type of hemolysis is produced by S. pneumoniae?
3. How is S. pneumoniae distinguished from other streptococci with the same hemolytic properties?
4. Describe the hemolysis produced by alpha-hemolytic, beta-hemolytic, and nonhemolytic streptococci.
5. What type of hemolysis is displayed by the groupable streptococci that are most pathogenic for
human beings?
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Essay Sample Content Preview:

Streptococci, Pneumococci, and Enterococci
Student’s Name
Institutional Affiliation
Streptococci, Pneumococci, and Enterococci
Question 1. The visibility of Streptococci is confirmed by long gram-positive chains, while shorter chains confirm that of pneumococci (McDevitt et al., 2020).
Question 2. Streptococcus pneumoniae produces alpha-hemolysis (McDevitt et al., 2020). It is also referred to as partial hemolysis since the red blood cells cell membrane remains unbroken. Clinical microbiologists use the phenotype in laboratories to describe the culture outcomes of alpha-hemolytic streptococci such as S. pneumoniae.
Question 3. A bile test is performed to distinguish S. pneumoniae from other streptococci in alpha hemolysis. The bile solubility results in activation of the main autolytic enzyme that can also be attained by sodium deoxycholate (CDC, 2019). The bile solubility test is conducted when a bile-salt solution is added to the blood agar on the tested microorganism. A positive result is established by clearance of the culture’s turbidity after comparison with the control tube.
Question 4. Alpha-hemolytic streptococci produce pa...
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