Ch. 41 - Anaerobic G- bacteria

Question 0

Bacteroides fragalis

Answer 0

Anaerobic G-b
Pleomorphic
Can resemble mixed culture

Adherence –> polysaccharide capsule and fimbriae

Cytotoxin enzymes: tissue destruction, O2 immunity

Toxin: diarrhea with intestinal epithelial changes and inflammation

Question 1

G- Anaerobes

Answer 1

Colonize upper resp, GI, UG
Stabilize resident flora
Prevent pathogen colonization
Aid in digestion

Disease in sterile body sites (polymicrobial)

G-b: 
Bacteroides **
Fusobacterium
Porphorymonas
Prevotella

G-c:
Viellonella

Question 2

Prevotella

Answer 2

Very small anaerobic G-b

Pigmented and non are bike susceptible

Question 3

Fusobacterium

Answer 3

Elongated anaerobic G-b with pointed ends

Question 4

Bacteroides

Answer 4

Anaerobic G-b
Growth stimulated by 20% bile

Typical G- cell wall
Little to no endotoxin activity

Question 5

Viellonella

Answer 5

Anaerobic G-c

Usually contaminant

Question 6

Porphorymonas

Answer 6

Anaerobic G-b

Pigmented are vile susceptible

Question 7

Anaerobic G- diseases

Answer 7

Resp infections 
Brain abscesses
Intra-abdominal infections
Gynecological infections
Skin and soft tissue infections

Many produce beta lactamases