Campylobacter and Helicobacter species Flashcards
What are the characteristic shapes of Campylobacter species when viewed microscopically?
Slender, curved rods in gull-winged shapes and spiral forms
What are the growth requirements for Campylobacter species in terms of atmospheric conditions?
Microaerophilic (5-10% oxygen, 1-10% CO2)
Which Campylobacter species appear as small, round, smooth, translucent colonies with a dewdrop appearance on enriched media?
Campylobacter fetus subspecies venerealis
Campylobacter fetus
Which Campylobacter species has a typical morphology of small, flat, grey colonies with a spreading, watery appearance on enriched media?
Campylobacter jejuni
What are the key metabolic characteristics of Campylobacter species?
Non-fermentative, oxidase-positive with variable catalase reactions
What virulence factor is associated with Campylobacter fetus subspecies venerealis and fetus, conferring resistance to serum-mediated destruction and phagocytosis?
Microcapsule or S layer
What is the principal cause of bovine genital campylobacteriosis, and how is it transmitted?
Campylobacter fetus subsp. venerealis, transmitted during coitus by asymptomatic carrier bulls
What are the primary causative agents of ovine genital campylobacteriosis?
Campylobacter jejuni
Campylobacter fetus subsp. fetus
What is the significance of observing large numbers of campylobacter-like organisms in dilute carbol fuchsin (DCF)-stained fecal smears or rectal scrapings from dogs with diarrhea?
It is indicative of infection with Campylobacter species.
Which Campylobacter species is commonly harbored in the intestinal tracts of birds and shed in their feces?
Campylobacter jejuni
What are the characteristic shapes of Helicobacter species?
Helical, S-shaped, or curved Gram-negative rods
What are the growth requirements for Helicobacter species in terms of atmospheric conditions?
Microaerophilic
What biochemical reaction is characteristic of Helicobacter species that colonize the gastric mucosa?
Strong urease reaction
Which Helicobacter species is associated with gastric ulcers, gastric adenocarcinoma, and mucosa-associated lymphoid tissue (MALT) lymphoma in humans?
Helicobacter pylori
What is the best way to visualize Campylobacter spp. from a bacterial culture?
Dilute Carbol Fuchsin stain
What is the result of Campylobacter spp. and Helicobacter spp. in an oxidase test?
Positive
