What are the growth conditions and primary diagnostic approach for Campylobacter jejuni in stool samples?

• A. Aerobic atmosphere; incubation around 37°C; culture on blood agar
• B. Microaerophilic atmosphere; incubation around 42°C; culture on Campy agar (Skirrow or Campy-BAP) or selective media
• C. Anaerobic atmosphere; incubation at 25°C; culture on MacConkey
• D. Microaerophilic atmosphere; incubation around 30°C; culture on chocolate agar

Answer: (B)

Campylobacter jejuni is a fastidious, microaerophilic organism that thrives when oxygen is reduced and heat is moderately high. When testing stool samples, the goal is to create an environment that supports its growth while suppressing competing bacteria. Incubating at about 42°C reflects its thermophilic tendency and helps distinguish it from many other enterics. Using selective media such as Campy agar (Skirrow or Campy-BAP) or other Campylobacter-selective plates provides antibiotics that inhibit the resident flora, allowing the organism to grow clearly and be identified. This combination of microaerophilic conditions, a incubation temperature around 42°C, and selective culture media is the standard and most effective approach for isolating Campylobacter jejuni from stool.

Aerobic conditions, non-selective blood agar, a 37°C incubation, or anaerobic environments without selective media do not adequately support isolation of Campylobacter jejuni and are not preferred for stool cultures.