Campylobacter jejuni

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Campylobacter jejuni
Scanning electron micrograph of C. jejuni demonstrating the chracteristic curved rod shape of the organism.
Scientific classification
Kingdom: Bacteria Phylum: Proteobacteria Class: Epsilon Proteobacteria Order: Campylobacterales Family: Campylobacteraceae Genus: Campylobacter Species: C. jejuni
Binomial name
Campylobacter jejuni (Jones et al. 1931) Veron & Chatelain 1973

Campylobacter jejuni is a species of curved, rod-shaped, non-spore forming, Gram-negative microaerophilic, bacteria commonly found in animal feces.^[1] It is one of the most common causes of human gastroenteritis in the world. Food poisoning caused by Campylobacter species can be severely debilitating but is rarely life-threatening. It has been linked with subsequent development of Guillain-Barré syndrome (GBS), which usually develops two to three weeks after the initial illness.

C. jejuni is commonly associated with poultry and naturally colonises the GI tract of many bird species. It has also been isolated from wombat and kangaroo feces, being a cause of bushwalkers' diarrhea. Contaminated drinking water and unpasteurized milk provide an efficient means for distribution. Contaminated food is a major source of isolated infections, with incorrectly prepared meat and poultry normally the source of the bacteria.

Infection with C. jejuni usually results in enteritis, which is characterised by abdominal pain, diarrhea, fever, and malaise. The symptoms usually persist for between 24 hours and a week, but may be longer. Diarrhea can vary in severity from loose stools to bloody stools. No antibiotics are usually given as the disease is self-limiting, however, severe or prolonged cases may require ciprofloxacin, erythromycin or norfloxacin. Fluid and electrolyte replacement may be required for serious cases.

Contents 1 Laboratory characteristics 2 See also 3 References 4 Images

[edit] Laboratory characteristics

Characteristic	Result
Growth at 25 °C	-
Growth at 35-37 °C	-
Growth at 42 °C	+
Nitrate reduction	+
Catalase test	+
Oxidase test	+
Growth on MacConkey agar	+
Motility (wet mount)	+
Glucose utilization	-
Hippurate hydrolysis	+
Resistance to naladixic acid	-
Resistance to cephalothin	+

Campylobacter is grown on specially selective "CAMP" agar plates at 42 °C, the normal avian body temperature, rather than at 37 °C, the temperature at which most other pathogenic bacteria are grown. Since the colonies are oxidase positive, they will usually only grow in scanty amounts on the plates. Microaerophilic conditions are required for luxurious growth. The selective medium known as Skirrow's medium is used. Skirrow's medium is blood agar infused with a cocktail of antibiotics: vancomycin, polymixin-B and trimethoprim under microaerophilic conditions at 42 degrees.

[edit] See also

• Campylobacteriosis

[edit] References

[edit] Images

Blood-free, charcoal-based selective medium agar (CSM) for isolation of Campylobacter jejuni.

Scanning electron micrograph depicting a number of Campylobacter jejuni bacteria.