streptococci aak
TRANSCRIPT
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STREPTOCOCCI
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Streptococci
facultative anaerobe
Gram-positive
chains or pairs
catalase negative
(staphylococci are catalase positive)
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Streptococcusin chains
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Streptococcu s pneumoniae(diplococcus). Fluorescent stain
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StreptococciLancefield groups
*Satu atau lebih spesies per group*antigen permukaan
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groupablestreptococci
A, B and D
most important C, G, F
rare
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Non-groupable
S. pneumoniae
pneumonia
viridans streptococci
e.g. S. mutans* dental caries
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hemolysis reaction - sheep blood
agar
(alpha)
partial hemolysis
green color
(beta)
complete clearing
A and B
(gamma)
no lysis
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Hemolysis
Groups A an B
Group D or
S. pneumoniaeand viridans
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hemolysis reaction + one characteristic
presumptive identification
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Group A streptococcus(S.
pyogenes)
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Group A streptococcal
menginfeksi semua umur
Insiden tertinggi pd usia 5-15thn
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S. pyogenes -suppurat ive
non-invasive
pharyngitis
Infeksi kulit, impetigo
invasive bacteremia
toxic shock-like syndrome
"flesh eating" bacteriapyrogenic toxin
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Pyrogenic toxin
superantigen
T cell mitogen
Mengaktifkan sistem imun
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Scarlet fever
rash
erythrogenic toxin
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non-suppurative
rheumatic fever inflammatory disease
life threatening
Sekuel kronik
demam
jantung
sendi rheumatic tidak sama dengan
rheumatoid arthritis
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Rheumatic fever -etiology
M protein
cross-reacts heart myosin
autoimun
Antigen dinding sel
sedikit dicerna in v ivo
bertahan lama
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Rheumatic fever
penicillin
- menyembuhkan pharyngitis
- Menurunkan resiko carditis
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Acute glomerulonephritis
immune complex disease of kidney
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Major pathogenesis factors
lipoteichoic acid/F protein
fimbriae
binds to epithelial cells
M protein
anti-phagocytic
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M protein
major target
Imunitas alami
strain variation
antigenicity
re-infection
Terjadi dengan strain yg berbeda
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Capsules
Anti-phagocytic
mucoid strains
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Isolation and identification
hemolytic colonies
bacitracin menghambat
pertumbuhan
hemolytic colonies
group A antigen
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hemolysis
hemolysin O
Sensitif oksigen
hemolysin SNon sensitive oksigen
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Post-infectious diagnosis
(serology)
Antibodi thd streptolysin O
Penting! Bila menetap sekuel
kronik terjadi
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M
T
R
Serotyping
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Group B streptococcus
neonatal meningitis
septicemia
transmission vaginal flora
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Group B streptococcus -
identification hemolysis
hippurate hydrolysis
CAMP reactionmeningkatkan hemolisis S. aureus
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Group D streptococcus
Tumbuh pada bile esculin agar
precipitasi hitam
6.5% salin
Tumbuh
enterococci
Tidak tumbuh
non-enterococci
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Enterococci
Hubungannya agak jauh dr streptococcilain
genus Enterococcus Flora usus
urinary tract infection Kontaminasi dr anus
opportunistic infections khususnya endocarditis
Paling sering E. (S.) faecalis
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Enterococci
resisten thd banyak antibiotik
termasuk vancomycin
ujung D-ala diganti dengan D-lactat
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Minute colony streptococciVarious groups (e.g. group A)
berbeda scr genetik
* koloni yg besar (e.g. S. pyogenes)
tdk ada demam rheuma
Koloni besar Koloni kecil
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Viridans streptococci diverse species
oral
Karies gigi
hemolytic dan negatif thd tes lain
non-groupable.
termasuk S. mutans
endocarditis
cabut gigi