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10 Cards in this Set

  • Front
  • Back
Group B Strep
Can cause neonatal secpticemia, meningitis, or pneumonia

Can have early/late onset (utero, birth or later)

60% of colonized mothers give birth to colonized babies

Blood cultures, swabs, CSF find G+ cocci

Obstetric Complications: UTI's, Peurperal sepsis, Amnionitis, Endometriosis, wound infections
Viridens Streptococci
S. Salavarius, S. Mitis

Can cause disease when introduced to abnormal heart valves.

Alpha hemolytic

Found in Normal flora of upper respiratory tract

Must be differentiated from S. Pneumnonia
Lactic Streptococci
Found in milk
Not associated with disease
Strep Lacis
Strep Cremoris
Group D Enterococcus
Enterococci-Streptococcus Gaecalis

Hemolysis variable (mostly non-hemolytic)

Protein/Carb factors regulate adherance

Bacteriocins: Inhibit competitive bacteria

Found in normal flora of intestinal tract

Common in pyelonephritis, wounds and subacute bacterial endocarditis

Resistant to antibiotics (VRE)
Vancomycin Resistant Enterococcus -Mediated by R-Plasmids

Risk factors: Urinary or intravascular cathertization

Capable of surviving high concentrations of bile and sodium chloride (Grew on MSA)
(E. Faecalis colonize large intestine 10
and urinary tract
Beta Hemolytic Strep
All contain a group specific C-carbohydrate

Serological grouping (lancefields typing)

Group A -S. Pyogens
Group B -S. Algalactae
Group C -Pathogen of animals
*Strep S_Stable/oxygen (hemolysis)
*Strep O-Inactivated by ox.(stab agar)
*Antigenic (ASO titer) Strep marker
*Cardiotoxid & Leukocidal
Initiates fibrinolytic dissolution
of fibrin clots.
Depolymerizes connective tissue
Erythrogenic toxin
Local redness/Scarlet fever
Found in cell wall -pilli
Strep Throat
signs/symptoms: red sore throat, white patches tonsils, swollen lymp nodes in neck, fever, headache (naus/vomit children sometimes)

Transmission: Direct close contact-respiratory droplets (cough/sneeze) Rarely from milk/milk products

Untreated patients most infectious 2-3wks after onset.

Incubation period before symptoms:
2-4 days after exposure

Patient no longer infectious after 24 hrs. of antibiotics

Diagnosis: throat swabbed for culture or rapid strep test (10-20 min) culture usually 24-48 hrs. (neg cult=viral)
Scarlet Fever
occurs w/sore throat and rarely w/impetego or other strep infections

fever/rash over upper body (may be all)

Rash is fine, red, rough texture and blanches upon pressure

Bright red strawberry tongue

skin can peel after recovery.

Illness spread by same means as strep/treatment same too
Strep Morpholoy and Physiology
G+ Cocci in chains
Colonies: very small convex / granular

Phys: facultative anaerobes
Fastidious nutritionally
(require blood, AA &nucleic acid
Catalase negative
Is not dissolved in 10% bile salt
Group A _ Strep. Pyogenes
Bacitracin identifies

Pharyngitis/Strep throat

Scarlet Fever
Skin infections
(Nec. Fa. flesh-eating)

Bactermia, sepsis, strep toxic shock synd,

Complications: Acute Rheumatic Fever
and Poststrep. glomerulitis