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Microbiology 2 > M10 Gram -Ve Bacteria 1 > Flashcards

M10 Gram -Ve Bacteria 1 Flashcards

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1
Q

what re the four main gram -ve bac

A

cocci
curved rods
strict anaerobes
facultative anaerobes

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2
Q

what are the two aerobic gram -ve cocci

A

neisseria

moraxella

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3
Q

what is an example of anaerobic gram -ve cocci

A

veillonella

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4
Q

what re some features of neisseira

A 
gram -ve 
facultative aerobe 
non motile
cocci 
pairs, triads, clusters
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5
Q

what are the pathogenic neisseria

A

gonorrhoeae

meningitides

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6
Q

what are some oral neisseria

A

subflava

sicca

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7
Q

what is imp about oral neisseria

A

early tooth colonisers

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8
Q

what is n. subflava

A

most commonly isolated

saccharolytic produces polysac and yellow pigment

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9
Q

what is n. sicca

A

mouth similar to subflava

no pigment prod

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10
Q

are n. subflave or n.sicca pathogenic

A

no

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11
Q

what is moraxella

A 
gram -ve bac 
neiseira like
asaccharyltic 
polysaccharide -ve 
Dnase +ve
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12
Q

what is the most imp sp of moraxlla

A

catarrhalis

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13
Q

what is moraxella catarrhalis

A

commensal

pathogen - tonislar b cells causing endocarditis, meningitis

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14
Q

what does catarrhalis prod

A

beta lactamase

complicates Ab therapy

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15
Q

what is veillonellla

A

small gram -ve anaerobic cocci

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16
Q

what does veillonella not do

A

ferment carbs

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17
Q

what des veillonella use as energy source

A

lactic acid –> acetate + 2 propionic acid + CO2 + H20

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18
Q

what is the most common strain of veillonell

A

parvula

19
Q

what kind of bac is parvula

A

strict anaerobe

20
Q

what does veillonella parvula do

A

catabolises lactic acid to weaker organic acids - inc pH

21
Q

what bac are present in community acquired pneumonia

A

moxarella 9.4%
veillionela 1.6%
oral streps 9.4%

22
Q

what are GNABs

A

gram negative anaerobic Bacilli

23
Q

what re some motile GNABs

A

selenomas
centipeda
helicobacter

24
Q

what are some non motile GNABs

A 
bacteriodes
porphyromonas 
prevotella 
(tannerella
fusobac)
25
Q

what is usually prescribed for anaerobic microbes

A

metronidazole

26
Q

what are selenomonas

A

-crescent + flagellae
- gram -ve
assc with aggressive periodontitis

27
Q

what are some imp sp of selnomonas

A

sputigena

noxia

28
Q

what are centipeda

A

one sp - periodontii

- flagella all round

29
Q

what are helicobacter

A

H.pylori
assc w/gastritis, peptic ulcers
in dental plaque

30
Q

what kind of bac are bacteriodes

A

strictly anaerobic gram -v bacilli

31
Q

what is a main sp of bacteriode

A

fragilis
in mouth
main pathogen

32
Q

what does a healthy gingival crevice contain

A

Gm +ve cocci

33
Q

below gingival crevice what happens

A

anaerobic conditions

nutrient from gingival tissues rather than food or saliva

34
Q

what happens in periodontitis

A

plaque inc = gingivitis
(streptococcus)

plaque between tooth and gum = pocket
(actinomyces )

pocket deep, gingiva recede and bone lost
(porphyromomas gingivalis and prevotella intermedia)

35
Q

what are some other sp of bactericiodes

A

prevotella
porphyromonas
tannerella forsythia

36
Q

whatarethe common themes of the bacteriodes

A

asaccharolytic

dark pigment

37
Q

what are some imp features of porphyromonas

A

dark pigment GNAB
assacharolytic - prod proteases
per pocket
p.gingivalis periodontopathogen

38
Q

what are some imp features of prevotella

A

dark pigment
saccharolytic
(sucrose –> acetic acid and succinic acid)

39
Q

what doe num of prevotella intermedia correlate with

A

periodontitis sererity

40
Q

what is prevotella dentalis

A

non pigmented

from root canals and perio pocket

41
Q

what does black pigmented bac require

A

iron

42
Q

what is o surface of BPB

A

porphyrins

with iron but without = photosensitive

43
Q

what is treat BPB with blue light

A

excitation
prod reactive oxygen species
destroy lipids,protein etc

Microbiology 2 (23 decks)

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