M8 Oral Streptococci

Question 1

what is an example of gram +ve aerobic

Answer 1

micrococci

Question 2

whats an ample of gram +ve anaerobic

Answer 2

peptrococcus

peptostreptococcus

Question 3

what is an example of facultative gram +ve

Answer 3

catalase +ve - staphylococus

cataras -ve - streptoccuss

Question 4

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

Answer 4

oral streptococci

Question 5

what do streptococci compromise orally

Answer 5

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

Question 6

what are streptococci sep mostly

Answer 6

facultative

little obligate anaerobes

Question 7

what do stretococci prod in anaerobic condos

Answer 7

lactic acid - reducing potential pH fro demineralisation

Question 8

what are the 4 main groups of streptococci spp

Answer 8

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

Question 9

what does the 23% of approximal plaque contain

Answer 9

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

Question 10

what is the in silico comparison of genomes

Answer 10

genes can be exchanged including resistance determinants

Question 11

what does the excnae of genes mean

Answer 11

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

Question 12

hat is alpha haemolysiss

Answer 12

oral streptococci
green (choc)
partial haemolysis (RBA)

Question 13

what is the beta haemolysis

Answer 13

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

Question 14

what is gamma haemolyss

Answer 14

no haemolysis
enterococcus faecilis
no haemolysis

Question 15

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

Answer 15

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

Question 16

what is dental caries

Answer 16

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

Question 17

what are some sub sp of mutant

Answer 17

s mutans
s sobrinus
s cricetus

Question 18

what is the mutant group lead to

Answer 18

cause of tooth decay

wide range carbs

Question 19

how does s mutans do for caries

Answer 19

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

Question 20

what is the most popular carb to use fro carb metab

Answer 20

sucrose

more energy in bond cause more dissolution enamel grow faster

Question 21

what are virulence factors imp for

Answer 21

colonisation
establish biofilm
acid prod
survival at low pH

Question 22

what is the oralis group

Answer 22

heterogeneous group of related streptococci

Question 23

what are some spp of oralis

Answer 23

s oralis
s sanguinis
s gordonii
s mites
s crista

Question 24

what do most of orals group produce

Answer 24

IgA protease

imp virulence factor

Question 25

what do s sanguines and s gordoniii do

Answer 25

produce extra cell sol and insole gluons | earlycolonisers

Question 26

what does s sanguinis do

Answer 26

bacterial endocarditis

Question 27

what does s gordonii do

Answer 27

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

Question 28

what does s mitis do

Answer 28

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

Question 29

what does s crista do

Answer 29

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

Question 30

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

Answer 30

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

Question 31

what is hermaetogenous spread

Answer 31

distributed by way of blood stream | s gordonii

Question 32

what is s salivarius

Answer 32

most dom in saliva prefer keratinsisded statures not in plaque

Question 33

how i saivarius beneficial microbe

Answer 33

prod bactericides | assc with infections

Question 34

what is s vestivularis

Answer 34

non pathogenic | non polysacc prod

Question 35

what is anginosus group

Answer 35

beta haemolysis

Question 36

what are the sep of anginosus

Answer 36

s anginosus s constellates s inetrmidus

Question 37

where are a anginsosus

Answer 37

in plaque | isolated form many infections in body

Question 38

what is s pneumonia

Answer 38

alpa haemolytic sensitive to optochin resp pathogen

Question 39

what si an organism sensitive to bacitracin

Answer 39

s progenies