A 35 years old patient complains of abdominal cramps along with profuse diarrhea. The treating physician wants to process the stool culture for isolation of Campylobacter jejuni. Which of the method of choice for stool culture?
Campylobacter jejuni is a common cause of bacterial gastroenteritis. The key here is the culture method. I remember that C. jejuni is a microaerophilic organism, meaning it requires lower oxygen levels than atmospheric. So, the culture conditions are crucial. The standard method uses selective media and a microaerophilic environment.
Now, looking at the correct answer options. The options aren't listed, but the correct answer is likely to be a specific culture method. Common choices might include blood agar, selective media like Skirrow's agar, or methods involving microaerophilic incubation. The correct answer is probably using a selective medium with microaerophilic conditions, maybe at a specific temperature like 42°C.
For the wrong options, they might include using ordinary media, aerobic incubation, or non-selective agar. Each of these would be incorrect because they don't meet the requirements for C. jejuni growth. For example, aerobic conditions would inhibit the bacteria, and non-selective media might not suppress other organisms.
Clinical pearl: Remember that microaerophilic conditions and selective media are essential for isolating C. jejuni. Also, incubating at 42°C helps differentiate it from other species. High-yield fact: Use selective media with microaerophilic environment and 42°C incubation.
Need to structure the explanation with the required sections. Core concept is the growth requirements of C. jejuni. Correct answer explanation involves the method's specifics. Wrong options are incorrect due to lacking microaerophilic conditions or selective agents. Clinical pearl reinforces the key steps. Correct answer line needs to be formatted correctly.
**Core Concept**
Isolation of *Campylobacter jejuni* requires **microaerophilic conditions** (low oxygen, 5–10% O₂, 5–10% CO₂) and **selective media** (e.g., Skirrow’s agar with cefoperazone and vancomycin) to inhibit other gut flora. The organism thrives at **42°C**, a temperature that enhances its growth while suppressing competitors.
**Why the Correct Answer is Right**
The **correct method** involves culturing stool on selective media (e.g., Skirrow’s or Butzler’s agar) under microaerophilic conditions at 42°C. *Campylobacter jejuni* is a **facultative microaerophile** with strict nutritional needs; it requires **reduced oxygen tension** (anaerobic bacteria would need 0% O₂) and **selective antibiotics** to outcompete coliforms and other enteric bacteria. Incubation at 42°C also mimics the human intestinal environment, promoting optimal growth.
**Why Each Wrong Option is Incorrect**
**Option A:** Standard sheep blood agar lacks selective agents and microaerophilic conditions, allowing overgrowth by normal flora.
**Option B:** Aerobic incubation at 37°C inhibits *Campylobacter* growth due to high O₂ levels and sub