Gram positive Cocci Flashcards
Difference between staph and strept?
Staph are Catalse +ve
Strept are Catalse -ve
Staph are classified according to ?
Coagulase enzyme
Toxin secreted by staph aureus
- Alpha toxin (hemolytic)
- Leukocidin
- Enterotoxin
- TSST
- Epidermolytic toxin
What are the super antigens of staph aureus ?
Toxic Shock Syndrome Toxin & Enterotoxin
Super antigens of strept pyogenes?
Toxic Shock Syndrome Toxin & Erythrogenic Toxin (causes scarlet fever)
Strept toxin acquired by phage?
Strept pyogenes’ erythrogenic toxin
Major virulence factor of strept pyogenes ?
M. Protein
Give an account on M. Protein
- Major virulence factor of strept pyogenes
- group A beta hemolytic streptococcus are sub-classified into 20 serotypes according to M. Protein
Streptococcus pyogenes capsule is
Hyaluronic acid , anti-phagocytic, non immunogenic
Most common cause of pharyngitis
Group A beta hemolytic Streptococcus pyogenes
Gram positive diplococci?
Streptococcus pneumonia & fecalis
Role of capsule in streptococcus pneumonia
Polysaccharide capsule that is anti phagocytic and antigenic , useful in diagnosis and classification of streptococcus pneumonia
Streptococcus pneumonia is commensal in ?
Oropharynx
Virulence factors of streptococcus pneumonia
Capsule anti phagocytic MAIN
IgA1 protease
Pneumolysin
Main Ig in Upper respiratory tract
IgA1
