M8 Oral Streptococci Flashcards Preview

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Flashcards in M8 Oral Streptococci Deck (39):
1

what is an example of gram +ve aerobic

micrococci

2

whats an ample of gram +ve anaerobic

peptrococcus
peptostreptococcus

3

what is an example of facultative gram +ve

catalase +ve - staphylococus
cataras -ve - streptoccuss

4

what is the largest single group of bacteria isolated from the mouth and can be cultivated from all oral sites

oral streptococci

5

what do streptococci compromise orally

23% plaque
30% gingival crevice
50% tongue
50% saliva

6

what are streptococci sep mostly

facultative
little obligate anaerobes

7

what do stretococci prod in anaerobic condos

lactic acid - reducing potential pH fro demineralisation

8

what are the 4 main groups of streptococci spp

mutans (alpha) - tooth surface
salivarius (alpha) - tongue
angionosus (beta) - plaque
oralis (alpha) - tooth

9

what does the 23% of approximal plaque contain

mutans 2%
sanguines 6%
saliavrius 1%
angionosus 0.5%

10

what is the in silico comparison of genomes

genes can be exchanged including resistance determinants

11

what does the excnae of genes mean

core genes
shared flowing of genes
abel to take up diff dn
acquire diff features from organisms

12

hat is alpha haemolysiss

oral streptococci
green (choc)
partial haemolysis (RBA)

13

what is the beta haemolysis

pathogenic streptococici
clear haemolysis
complete haemolyssi on blood agar
s. progenes

14

what is gamma haemolyss

no haemolysis
enterococcus faecilis
no haemolysis

15

on blood agar what does alpha, beta and gamma haemolysis do

alpha - greening of colonies (pneumonia)
beta - clearing, vlanceield, greening
gamma -normal, no haemolysis

16

what is dental caries

localised dissolution of enamel
may advance to dentine and pulp
common in pits and fissures
accumulation of plaque

17

what are some sub sp of mutant

s mutans
s sobrinus
s cricetus

18

what is the mutant group lead to

cause of tooth decay
wide range carbs

19

how does s mutans do for caries

bind and colonies - extracell polysaccs
prod acid high rate from sugar - acidogenic
tolerate high conc of acid - acidic

20

what is the most popular carb to use fro carb metab

sucrose
more energy in bond cause more dissolution enamel grow faster

21

what are virulence factors imp for

colonisation
establish biofilm
acid prod
survival at low pH

22

what is the oralis group

heterogeneous group of related streptococci

23

what are some spp of oralis

s oralis
s sanguinis
s gordonii
s mites
s crista

24

what do most of orals group produce

IgA protease
imp virulence factor

25

what do s sanguines and s gordoniii do

produce extra cell sol and insole gluons
earlycolonisers

26

what does s sanguinis do

bacterial endocarditis

27

what does s gordonii do

close to s sanguinis but prod alpha amylase rather than IgA protease
cause infective endocarditis
PadA surface protein - adhesion and interacts with platelet via fibrinogen receptor

28

what does s mitis do

prefer non jeratinsied in mouth such as cheek
ma cause bacteraemia endocarditis and abscesses

29

what does s crista do

similar to s sanguinis but with tufts of fibrils on surface
cons cobs

30

what are the isolation frequency of s sanguines, oralis nd gorfonii

sanguines - 32%
oralis - 30%
gordonii - 13%
other - 5%

31

what is hermaetogenous spread

distributed by way of blood stream
s gordonii

32

what is s salivarius

most dom in saliva
prefer keratinsisded statures
not in plaque

33

how i saivarius beneficial microbe

prod bactericides
assc with infections

34

what is s vestivularis

non pathogenic
non polysacc prod

35

what is anginosus group

beta haemolysis

36

what are the sep of anginosus

s anginosus
s constellates
s inetrmidus

37

where are a anginsosus

in plaque
isolated form many infections in body

38

what is s pneumonia

alpa haemolytic
sensitive to optochin
resp pathogen

39

what si an organism sensitive to bacitracin

s progenies