Презентация на тему Introduction to Enterobacteriaceae

with peritrichous flagella
Shigella and Klebsiella are nonmotile
Oxidase-negative facultative

anaerobes
Reduce nitrate
Ferment glucose and other carbohydrates
Many genera
Escherichia, Salmonella, Shigella, Klebsiella, Proteus, Enterobacter, Yersinia, etc.
Some strains opportunistic pathogens
Some strains true pathogens
Salmonella, Shigella, Yersinia, some strains of E. coli

the way to N2
Oxidase negative
Distinguishing Properties Associated

with All Enterobacteriaceae:

LPS; Lipid A is toxic component

3. Heat

stable

4. Antigenic; ??immunogenicity

5. Toxoids cannot be produced

6. Many effects on host

7. Produced by gram-negative organisms only

EXOTOXIN

1. Released from the cell before
or after lysis

2. Protein

3. Heat labile

4. Antigenic and immunogenic
5. Toxoids can be produced

6. Specific in effect on host

7. Produced by gram-positive and gram-negative organisms

endotoxic component

moiety in core polysaccharide

stable O antigen is often used to serotype

Numbers and Arrangements of Flagella

a single flagellum at one
or both ends of

the cell
Multitrichous, two or several flagella at one
or both ends of the cell
Lateral Flagella arise predominantly from the
middle pole of the cell
Monotrichous, one flagellum
Multitrichous, several flagella in the form
of a tuft originating from the midportion
of the cell
Peritrichous Random, haphazard arrangement of
flagella scattered around the bacterial cell
Mixed Two or more flagella exhibiting distinctly
different physical properties in different regions of the bacterial cell

Taxonomic Descriptions of Prokaryotes Based on Numbers and Arrangements of Flagella (cont.)

can be considered true pathogens

spp.

Shigella spp.

Yersinia spp.
Medically Important Enterobacteriaceae

the way to N2
Oxidase negative
Distinguishing Properties Associated

with All Enterobacteriaciae:

REVIEW

LPS; Lipid A is toxic component

3. Heat

stable

4. Antigenic; ??immunogenicity

5. Toxoids cannot be produced

6. Many effects on host

7. Produced by gram-negative organisms only

EXOTOXIN

1. Released from the cell before
or after lysis

2. Protein

3. Heat labile

4. Antigenic and immunogenic
5. Toxoids can be produced

6. Specific in effect on host

7. Produced by gram-positive and gram-negative organisms

REVIEW

Numbers and Arrangements of Flagella
REVIEW

can be considered true pathogens
REVIEW