BACTE LEC - Strep Flashcards
morphology of strep
cocci in chains or pairs
metabolism of strep
lactic acid fermentation
normal habitat of strep
throat, upper RT
catalase rxn
-
growth of strep more pronounced on which agar
enriched agar [blood agar]
appearance of colonies
pinpoint, transparent colonies
strep requires increased ___for growth
CO2
pigment of serrati
prodigiosin [red]
pigment of aeruginosa
thiocyanin [blue green]
classif based on physiologic characteristics
pus producing
pyogenic
type of hemolysis of pyogenic strep
beta
type of hemolysis of viridans
alpha or non
type of hemolysis of lactic acid –
non-hemolytic/gamma
classif based on physiologic characteristics
elevation of wbc
pyogenic
classif based on physiologic characteristics
opportunistic patho
viridans
not part of lancefield group
viridans
classif based on physiologic characteristics
non hemolytic, dairy products, Lancefield group N
Lactic acid
classif based on physiologic characteristics
flora of intestine
resistant to vancomycin
enterococci
strep Grp A susceptible to
Bacitracin
group a and group b RESISTANT TO
Sulfomethoxazole and Trimethoprim (SXT)
for accuracy of group a identification
Sulfomethoxazole and Trimethoprim (SXT)
resistant to bacitracin and sxt
s agalactiae
group a strep classified accdg to
cell wall structure
pathogenic determinants of group a strep
M protein
Antiphagocytic substance/enzyme
adherence to mucosal cells
two hemolysin
SLO and SLS
prevents phagocytosis, adheres to cell wall
M protein
type of hemolysin
oxygen labile
slo
type of hemolysin
active on reduced form [anaerobic]
-highly antigenic
slo
type of hemolysin
-oxygen stable
SLS
type of hemolysin
- hemolysis around colony [aerobic]
- non-antigenic
SLS
type of hemolysin
-lyses leukocytes
SLS
causes scarlet fever/rash
erythrogenic toxin
spreading factor
hyaluronidase
redness of skin
erythema
fibrinolytic
utilized as treatment for blood clot
streptokinase
clinical infections
also called strep throat
abrupt onset
bacterial pharyngitis and tonsilitis
clinical infections
ast very predictable
bacterial pharyngitis and tonsilitis
clinical infections
s/s: sore throat, malaise, fever, headache, nausea, vomiting, abdominal pain
bacterial pharyngitis and tonsilitis
clinical infections
s/s: tonsils and pharynx inflamed
bacterial pharyngitis and tonsilitis
clinical infections
s/s: cervival lymph nodes: swollen and tender
bacterial pharyngitis and tonsilitis
clinical infections
s/s: weeping lesions
pyodermal infection/impetigo
onset of pyodermal infection
2-5 years
onset of bacterial pharyngitis and tonsilitis
abrupt
easily treated infection
pyodermal infection/impetigo
MOT for bacterial pharyngitis and tonsilitis
droplets and close contact
caused by erythrogenic toxin
scarlet fever
s/s: desquamation, strawberry tongue, tongue yellow white w/ red
scarlet fever
susceptibility test for scarlet fever
dick’s test
test: erythrogenic toxin is injected
dick’s
+ test for dick’s t
redness and swelling
implication of + test in dick’s test
susceptible to scarlet fever, no Ab yet
diagnostic test for scarlet fever
schultz-charlton reaction
test:antierythrogenic toxin is injected
schultz-charlton reaction
result of schultz-charlton reaction
rash will blanch then fade
