B-hemolytic Streptococci Flashcards
What do staph. aureus and strep. pyogenes have in common?
they are both gram + cocci
How does streptococcus grow?
chains
(from humans)
Do streptococci use oxygen?
not necessarily- they can tolerate low oxygen though
What is most common strep. in strep throat, necrotizing fasciitis, rheumatic heart disease, and scarlet fever?
Group A = S. pyogenes
most important B-hemoltyic strep
What is the most common strep in upper respiratory problems?
mitis- s. pneumonia
most common meningitis
What is the most common strep in dental caries and periodontal disease?
mutans- s. mutans and s. sobrinus
T/F: streps evolve quickly
True!
it exchanges DNA by transformation
What is glomerulonephritis and what is it caused from?
it makes antibodies against filtration system of kidney due to post infection of strep
Which has more diverse infectious diseases: staph aureus or strep pyogenes?
strep pyogenes
include: skin infections, throat & respiratory infections, scarlet fever, strep toxic shock, pneumonia
T/F: strep death rates didn’t start going down til antibiotics were developed
False!
- unknown why… maybe due to less toxins or better hygiene
Pneumonia is usually caused from _______ and less likely from __________.
usually= S. pneumonia
less likely= S. pyogenes Group A
Toxic Shock Syndrome can be caused from:
Staph. aureus and strep. pyogenes
What is a key virulence factor that have long fibrillar molecules and is variable in strep pyogenes?
M protein
T/F: S. pneumonia have M protein too
False!
Only Strep. pyogenes
What does M protein do?
- extend from surface of a cell… protein capsule
- inhibit phagocytosis
- bind host peptides with roles in immunity
