Streptococcus Vs. Staphylococcus

Question 1

Does Streptococcus and staphylococcus have the ability to cause hemolysis? If not, which one does and which one doesn’t and why?

Answer 1

No.
Staphylococcus has the ability to cause hemolysis.

With streptococcus it varies depending on type

Question 2

The MSA test, helps diagnose staphylococcus and streptococcus by looking for what?

Answer 2

By looking for growth on a salt agar plate (MSA)

Staphylococcus= growth+
Streptococcus= growth-

Question 3

The catalase test, helps you diagnose what in staphylococcus and streptococcus?

Answer 3

To see if catalase his present by breaking hydroperoxide into water and oxygen

Staphylococcus= + (bubbles)
Streptococcus= - (no bubbles)

Question 4

The strain of Streptococcus pyogens causes what in the US?

In other countries it’s?

Answer 4

In the US it causes strep throat

In other countries it causes impetigo

Question 5

Strep throat and impetigo are considered what type of infections?

Answer 5

Localized infections

Question 6

What are the three systemic infections of streptococcus?

Answer 6

1) scarlet fever
2) Child bed fever
3) rheumatic fever

Question 7

What’s the percentage of strep throat progressing to scarlet fever?

Answer 7

10%

Question 8

How can Strep throat developed to scarlet fever?

Answer 8

By containing the gene that can develop into scarlet fever

Question 9

The additional gene that develops to scarlet fever is a virulence factor that contains and exotoxin called?

Answer 9

Erythrogenic toxin

Question 10

Erythrogenic toxin causes?

Answer 10

1) systemic rash all over the body (making it scaly and tough)
2) high fever that leads to vasodilation
3) can cause shock, organ failure, even death in high fevers

Question 11

Erythromycin is _____ not the bacteria.

Answer 11

Systemic

Question 12

Erythrogenic toxin comes from?

Answer 12

Bacterial cells of streptococcus pyogens that are infected by a virus.

This virus is specific to streptococcus pyogens bacteria

Question 13

Viruses that infect streptococcus pyogenes carry the gene code for Erythrogenic Toxin and make bacteria….?

Answer 13

Make it and secrete it.

Question 14

Childbed fever

Answer 14

Is a historical disease caused by streptococcus pyogenes in newly postpartum mothers

-huge number of bacteria in the blood causes septic shock and death

Question 15

What’s the ability to survive for streptococcus

Answer 15

It is very delicate outside of a human but highly infectious when they are inside
- easily killed outside of host

Question 16

What is the sensitivity to physical and chemical antimicrobial agents of streptococcus

Answer 16

Many are sensitive to drugs but Streptococcus pneumonia can be drug resistant

Question 17

What’s the ability to survive outside the host for staphylococcus?

Answer 17

It is very hardy and can survive outside the host such as tables floors and skin

Question 18

What’s the sensitivity to physical and chemical antimicrobial agents for staphylococcus

Answer 18

It tolerates dry and salty

Can become drug resistant in a hospital setting – acquired staphylococcus aureus

Question 19

If Staphylococcus was caught in the community, the likelihood of being nonresistance is..

Answer 19

HIGH

Question 20

Both streptococcus and staphylococcus are what type a Gram stain?

Answer 20

Gram-positive

Question 21

What two diagnostic test separate staphylococcus aureus from Staphylococcus epidermis

Answer 21

Coagulase test

MSA

Staph aureus makes yellow agar
Staph epidermis makes pink Agar