Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
Group B Strep
Agalactae |
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) Fibrinolytic 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) 7 (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 |
|
|
Streptolysins
|
Streptolysins
*Strep S_Stable/oxygen (hemolysis) *Strep O-Inactivated by ox.(stab agar) *Antigenic (ASO titer) Strep marker *Cardiotoxid & Leukocidal Streptokinase- Initiates fibrinolytic dissolution of fibrin clots. Hyaluronidase Depolymerizes connective tissue Erythrogenic toxin Local redness/Scarlet fever M.Protien 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 derivatives) Catalase negative Is not dissolved in 10% bile salt ENCAPSULATED Blood Agar: HEMOLYTIC |
|
|
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 |
