Streptococcus Vs. Staphylococcus Flashcards
Does Streptococcus and staphylococcus have the ability to cause hemolysis? If not, which one does and which one doesn’t and why?
No.
Staphylococcus has the ability to cause hemolysis.
With streptococcus it varies depending on type
The MSA test, helps diagnose staphylococcus and streptococcus by looking for what?
By looking for growth on a salt agar plate (MSA)
Staphylococcus= growth+ Streptococcus= growth-
The catalase test, helps you diagnose what in staphylococcus and streptococcus?
To see if catalase his present by breaking hydroperoxide into water and oxygen
Staphylococcus= + (bubbles) Streptococcus= - (no bubbles)
The strain of Streptococcus pyogens causes what in the US?
In other countries it’s?
In the US it causes strep throat
In other countries it causes impetigo
Strep throat and impetigo are considered what type of infections?
Localized infections
What are the three systemic infections of streptococcus?
1) scarlet fever
2) Child bed fever
3) rheumatic fever
What’s the percentage of strep throat progressing to scarlet fever?
10%
How can Strep throat developed to scarlet fever?
By containing the gene that can develop into scarlet fever
The additional gene that develops to scarlet fever is a virulence factor that contains and exotoxin called?
Erythrogenic toxin
Erythrogenic toxin causes?
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
Erythromycin is _____ not the bacteria.
Systemic
Erythrogenic toxin comes from?
Bacterial cells of streptococcus pyogens that are infected by a virus.
This virus is specific to streptococcus pyogens bacteria
Viruses that infect streptococcus pyogenes carry the gene code for Erythrogenic Toxin and make bacteria….?
Make it and secrete it.
Childbed fever
Is a historical disease caused by streptococcus pyogenes in newly postpartum mothers
-huge number of bacteria in the blood causes septic shock and death
What’s the ability to survive for streptococcus
It is very delicate outside of a human but highly infectious when they are inside
- easily killed outside of host
What is the sensitivity to physical and chemical antimicrobial agents of streptococcus
Many are sensitive to drugs but Streptococcus pneumonia can be drug resistant
What’s the ability to survive outside the host for staphylococcus?
It is very hardy and can survive outside the host such as tables floors and skin
What’s the sensitivity to physical and chemical antimicrobial agents for staphylococcus
It tolerates dry and salty
Can become drug resistant in a hospital setting – acquired staphylococcus aureus
If Staphylococcus was caught in the community, the likelihood of being nonresistance is..
HIGH
Both streptococcus and staphylococcus are what type a Gram stain?
Gram-positive
What two diagnostic test separate staphylococcus aureus from Staphylococcus epidermis
Coagulase test
MSA
Staph aureus makes yellow agar
Staph epidermis makes pink Agar
