70. Genera Vibrio and Lawsonia.

Question 1

Vibrio Habitat?

Answer 1

Habitat: • water, intestine, aquatic animals

Question 2

Vibrio Morphology?

Answer 2

Morphology: • 1.5-3 µm curved rod • flagella: 1 polar flagellum

Question 3

Vibrio Staining?

Answer 3

Staining: • Gram-negative

Question 4

Vibrio Culture?

Answer 4

Culture: • not fastidious, • facultative anaerobic, • selective culture: pH 8.6

Question 5

Vibrio Biochemistry?

Answer 5

Biochemistry: • catalase +, • oxidase +/-, • fermentative

Question 6

Vibrio Pathogenecity?

Answer 6

Pathogenicity:

• pathogens - facultative pathogens – saprophytes

Question 7

Vibrio Species?

Answer 7

Species •

V. cholerae

• V. metschnikovii
• V. parahaemolyticus
• V. vulnificus
• V. (Listonella) anguillarum

Question 8

Vibrio Cholerae?

Answer 8

V. cholerae

• types
• O1
• classical biotype
• El Tor biotype
• O139 (V. cholerae Bengal)
• virulence factors (O1, O139)
• exotoxins (cholera toxin), resembles E. coli LT toxin
• extracellular enzymes
• pathogenicity (O1, O139): humans: cholera
• other O-types (except O1 and O139)
• do not produce toxin
• sporadic diarrhoea

Question 9

Vibro. metschnikovii?

Answer 9

V. metschnikovii

1. Habitat: • water, sewage, • aquatic animals
2. Biochemistry: • oxidase -
3. Pathogenicity: • poultry haemorrhagic enteritis • human septicaemia

Question 10

Vibrio Parahaemolyticus?

Answer 10

V. parahaemolyticus:

• sea, sea animals,
• virulence factor:
• thermo stabile haemolysin
• food born infection in humans
• gastroenteritis, septicaemia, fever, haemorrhagic enteritis

Question 11

Vibrio vulnificus?

Answer 11

V. vulnificus • sea, marine animals • human wound infection, septicaemia

Question 12

Vibrio anguillarum?

Answer 12

V. (Listonella) anguillarum:

• sea,
• salmon, eel: septicaemia

Question 13

Lawsonia Habitat?

Answer 13

Habitat: • swine, foal enterocytes • intra cellular

Question 14

Lawsonia Morphology?

Answer 14

Morphology: • curved thin rods

Question 15

Lawsonia Staining?

Answer 15

Staining: • Gram-negative

Question 16

Lawsonia Culture?

Answer 16

Culture: • obligate intracellular bacterium • cultured in enterocyte cell line • microaerophilic

Question 17

Lawsonia Pathogenicity?

Answer 17

Pathogenicity: • swine proliferative enteropathies