L8 Flashcards
Streptococci
Gram?
shape?
arranged in?
positive
cocci
arranged in pairs or chains.
Alpha -hemolysis Streptococci
- Streptococcus pneumoniae and Streptococcus viridans
Beta-hemolysis Streptococci
Streptococcus pyogenes and Streptococcus agalactiae
Gamma -hemolysis Streptococci
Enterococci
group A?
Streptococcus pyogenes
group B?
Streptococcus agalactiae
Pyrogenic exotoxin A of Streptococcus pyogenes
scarlet fever
Pyrogenic exotoxin B of Streptococcus pyogenes
flesh-eating bacteria
Pyrogenic exotoxin C of Streptococcus pyogenes
toxic shock syndrome
Streptolysins use in?
ASO
most common infection transmitted by inhalation of droplets
Sore throat or pharyngitis
start as itching papules that break & form a yellow crust (Honey crust), it is highly contagious
Pyoderma (impetigo)
skin infection characterized by redness, oedema and a rapidly
advancing margin, often on the face
Erysipelas
diffuse inflammation affects all layer of skin without localization of
pus.
Cellulitis
: infection of uterus after delivery
Puerperal sepsis
Deformed heart or rheumatically affected valve encourages condition
Acute bacterial endocarditis
Toxigenic infection
Necrotizing fasciitis & Scarlet fever
Invasive infection
Erysipelas
Cellulitis
Puerperal sepsis
Acute bacterial endocarditis
Acute glomerulonephritis
type III hypersensitivity reaction
Acute rheumatic fever treated by
long-acting penicillin.
cross reactivity, antibody against M protein react with heart valves
Acute rheumatic fever
Streptococcus pyogenes- Treatment
Penicillin & Erythromycin is alternative (allergic to Penicillin).
- Long-acting penicillin should be given as a
chemoprophylaxis
Streptococcus agalactiae
female Genital tract & Diseases: neonatal meningitis
Bacitracin disc sensitivity in Streptococcus agalactiae
negative
Lancefield Serogrouping in Streptococcus agalactiae
group B
