72. Genera Helicobacter and Arcobacter.

Question 1

Helicobacteria Habitat?

Answer 1

Habitat: • mammals, humans • mucous membrane (stomach, duodenum)

Question 2

Helicobacter Morphology?

Answer 2

Morphology: • 1.5-5 µm, curved rod, helical

Question 3

Helicobacter staining?

Answer 3

Staining: • Gram-negative

Question 4

Helicobacteria Biochemistry?

Answer 4

Biochemistry: • catalase +, • oxidase +, • urease +, • carbohydrates not utilised, • cytotoxin (H. pylori)

Question 5

Helicobacteria Resistance?

Answer 5

Low

Question 6

Helicobacter Pathogenicity and species?

Answer 6

Pathogenicity, species:

• H. pylori: • toxin production • human chronic gastritis, gastric/duodenal ulcer, tumour

• H. felis: • cat, dog chronic gastritis

• H. canis: • dog chronic gastritis
• H. mustelae: • weasel chronic gastritis •

H. acinonychis: • cheetah chronic gastritis

• H. suis • gastritis, ulcer

Question 7

Arcobacteria Habitat?

Answer 7

Habitat: • mucous membranes (genitals, intestine)

Question 8

Arcobacteria Morphology?

Answer 8

Morphology: • 1-3 µm curved rods, flagella

Question 9

Arcobacteria Staining?

Answer 9

Staining: • Gram-negative

Question 10

Arcobacteria Culture?

Answer 10

Culture: • fastidious • microaerophilic → aerotolerant,

Question 11

Arcobacteria Pathogenicity?

Answer 11

Pathogenicity:

• A. cryaerophilus: • cattle, swine faeces • abortion, • mastitis,
• A. skirrowii: • faeces • prepuce (bull), • abortion (cow, pig, sheep),
• A. butzleri: • human, apes enteritis, • abortion (cattle)