Micro - Take 2 - Strep Infections

lunalovegood's version from 2016-02-01 00:01

Section 1

Question Answer
At ___-____%, streptococci are part of the normal flora.50-70% (perhaps this means just in the oral cavity?)
T/F - Improvements in oral hygiene may reduce the risk of developing infective endocarditis.True
T/F - Poor oral hygiene can lead to bacteremia after toothbrushing.True
Definition - CAPNOPHILICorganisms like medium with high carbon i.e. carbon dioxide
Strep is catalase _________ and Staph is catalase ___.negative, positive

Section 2

Question Answer
Gram _______positive
Divide along a ...single axis
Motile or non-motile?Non-motile
Spore or non-spore forming?Non-spore forming
Do they have capsules?some (part of their pathogenicity)
Do they have enriched nutritional requirements?yes
They ferment _____.carbohydrates
Catalase- ______ (negative or positive)negative

Section 3

Question Answer
What are the 3 different classification methods for streptococcus?1. Serologic classification 2. Hemolytic classification and 3. Biochemical classification
For A-W, group specific antigens (usually carbs of cell wall) (Lancefield grouping)Serologic classification (only for beta group because they were more important in medicine at the time)
Divides into alpha, beta, and gammaHemolytic classification
Completely lyses blood cellsBeta
Semi-capable to lyse blood cellsAlpha
Cannot lyse blood cellsGamma
Not really used that muchBiochemical classification
Small, sharp and with yellow lysis around itBeta (small, pin-point, translucent colonies)
Lancefield grouping was originally developed to differentiate ___-hemolytic strains.Beta (A, B, C, D, F, G)
Lancefield grouping detected by ___ ____.rapid immunoassay
T/F - Most alpha and gamma hemolytic strains DO NOT have the group specific antigens.True (most, but not all)

Section 4

Question Answer
Gizelda is having a baby. What is the most concerning streptococcus?Group B strep infection (swab vag before giving birth, strep B needs to be correct lvl, or else heavy AntiB)
Most famous Group B Strep?Streptococcus pyogenes
T/F - S. pyogenes causes a variety of suppurative and non suppurative diseases.True
Who does S. pyogenes affect?ALL AGES (peak incidence 5-15 yo)
S. pyogenes PEAK incidence?5-15 years of age