Question

In: Biology

determine whether the following refers to staphylococcus aureus, streptococcus pyogenes, nether or both.

 

determine whether the following refers to staphylococcus aureus, streptococcus pyogenes, nether or both.

1. erythrogenic toxins

2. clusters of cells

3. catlaise postive

4. gram postive

5. necrotizing fasciitis

6. pencililn resitant

7. Toxic Shock syndrome

8. endotoxins

Solutions

Expert Solution

1. Erythrogenic toxins - Streptococcus pyogenes
2. Clusters of cells - Staphylococcus aureus
3. Catalase positive - Staphylococcus aureus
4. Gram positive - Streptococcus pyogenes , Staphylococcus aureus
5. Necrotizing fasciitis - Streptococcus pyogenes
6. Penicillin resistant - Staphylococcus aureus
7. Toxic shock syndrome - Streptococcus pyogenes , Staphylococcus aureus
8. Endotoxins - Neither Streptococcus pyogenes nor Staphylococcus aureus

Explanation:
1. Streptococcus pyogenes secretes exotoxins called Erythrogenic toxins which are also know as streptococcal pyrogenic exotoxins.

2. Staphylococcus aureus has the ability to form clusters which are often seen as grape like clusters.

3. All staphylococci are catalase positive and oxidase negative whereas Streptococcus pyogenes is catalase negative and oxidase negative too.

4. Both Streptococcus pyogenes and Staphylococcus aureus are gram positive bacteria which gives blue colored positive result in gram staining.

5. Type II necrotizing fasciitis is caused by Streptococcus pyogenes. Staphylococcus aureus does not cause this but recently a methicillin resistant strain of S. aureus has been found to be responsible for this.

6. Methicillin-resistant Staphylococcus aureus is responsible for penicillin resistance in S. aurues whereas S. pyogenes is susceptible to antibiotics.

7. Toxic shock syndrome is caused by both Streptococcus pyogenes and Staphylococcus aureus by secreting super antigens. Staphylococcus aureus causes streptococcal Toxic shock syndrome.

8. Endotoxins - Neither Streptococcus pyogenes nor Staphylococcus aureus produces endotoxins. Both produces exotoxins.


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