Throat/ antigenic identification

Question 1

In the respiratory system, where has a higher amount of microbes?

Answer 1

nose and throat

Question 2

In the respiratory system, where has a lower amount of microbes?

Answer 2

larynx, trachea, bronchial tubes, alveoli

Question 3

The throat is a warm, moist environment that bacteria like, but the rate of infection is minimal. Why?

Answer 3

Microbial antagonism: microbes suppress the growth of others because they are in competition of nutrients

Question 4

What is the predominant genus in the throat? they are also they major cause of bacterial sore throats

Answer 4

Streptococci

Question 5

How can one identify streptococci?

Answer 5

Biochemically (hemolytic) and antigenitcally (Lancefields system)

Question 6

In biochemical identification, streptococci can form hemolysis on _____ agar.

Answer 6

blood

Question 7

On blood agar, alpha and gamma are ____ flora. While Beta means that a ____ may be present.

Answer 7

normal, pathogen

Question 8

The antigens on the cell wall of streptococci are put into groups __ through __.

Answer 8

A, O

Question 9

What are the three characteristics of group a strep?

Answer 9

beta-hemolytic, pathogenic to humans and sensitive to bacitracin

Question 10

In group A strep, the beta-hemolytic portion of the characteristics has two substances. What are they?

Answer 10

streptolysin S: O2 stable

Streptolysin O: inactivated by O2

Question 11

What is an example of a group a strep? What are two diseases it causes?

Answer 11

Streptococcus pyogenes ( strep throat, necrotizing fasciitis)