Homework answers / question archive / University of Texas, Rio Grande Valley - CLSC 2429 Exercise 19 1)Differentiate the microscopic morphology of streptococci and pneumococci as seen by Gram     stain

University of Texas, Rio Grande Valley - CLSC 2429 Exercise 19 1)Differentiate the microscopic morphology of streptococci and pneumococci as seen by Gram     stain

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University of Texas, Rio Grande Valley - CLSC 2429 Exercise 19

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.

What is the quellung reaction?

4.

What role does a bacterial capsule play in infection?

5.

Why is blood agar considered a differential medium?

6.

What is the function of a candle jar?

7.

Describe the principle of the latex agglutination test.

8.

Is the normal flora of the upper respiratory tract harmful to the human host? Explain.

 

 

9. Is the normal flora beneficial to the host?  Explain.

10. In collecting a throat culture, why is it important not to touch the swab to other surfaces in the mouth?

• 11. What specimens are of value in making a laboratory diagnosis of bacterial pneumonia?  Why? Explain the difference between saliva and sputum.
  • 12. Would a direct Gram stain of a sputum specimen be of any immediate value to the physician in choosing treatment for a patient with pneumonia?  Explain.
  • 13. What is the significance of VRE?

 

Exercise 20

1. What is the satellite phenomenon?
2. What is the incidence of Haemophilus influenzae as an agent of meningitis in infants and children under 3 years of age?  In adults?
   • 3. Why is a direct smear of spinal fluid essential when bacterial meningitis is suspected?
     • 4. How can a diphtheroid be distinguished from the agent of diphtheria?