Part of the foodborne pathogens pillar of the TAAG Learning Center, along with Listeria monocytogenes.
Table of contents
What is Campylobacter?
Campylobacter is a genus of curved or spiral-shaped rod bacteria ("gull-wing" shaped) that are microaerophilic (they need an atmosphere with less oxygen than ambient air to grow) and occur naturally in the intestinal tract of poultry and other farm animals. According to CDC and EFSA data, it is the most common bacterial cause of foodborne illness worldwide, outnumbering pathogens such as Salmonella in reported cases in several countries.
Why is it so common?
Natural reservoir in poultry
The intestinal tract of poultry is the main reservoir of Campylobacter, and during slaughter part of that intestinal content can be transferred to the carcass surface if process controls fail. This makes it a risk closely associated with the poultry meat industry, although it has also been detected in raw milk and untreated water.
Low infective dose
Unlike pathogens that need a relatively high bacterial load to cause illness, it is estimated that just a few hundred Campylobacter cells may be enough to cause infection, which helps explain its high incidence even at low contamination levels.
Symptoms and complications
Campylobacteriosis typically presents with diarrhea (sometimes bloody), abdominal pain, fever and nausea, 2 to 5 days after exposure, and in most cases resolves without treatment. However, in a small proportion of patients it can trigger Guillain-Barré syndrome weeks later, an autoimmune disorder that affects the peripheral nervous system and one of the reasons public health agencies monitor it closely.
How is Campylobacter detected in the laboratory?
Traditional culture: a technical challenge
Unlike bacteria such as Salmonella or E. coli, which grow well under standard aerobic conditions, Campylobacter is microaerophilic and sensitive to normal atmospheric oxygen. Its traditional culture requires incubators with a controlled atmosphere (low in oxygen, with added carbon dioxide), higher incubation temperatures than usual (around 42 °C) and specific selective media, which makes it more technically demanding than isolating other pathogens, with confirmation times of several days.
Molecular methods
PCR detects the genetic material of Campylobacter without depending on its growth under specific atmospheric conditions, which reduces both turnaround time and the operational complexity of the laboratory compared with traditional culture.
Control measures in the poultry industry
Control focuses mainly on the slaughter stage: good pre-slaughter handling practices, reducing cross-contamination between carcasses, surface decontamination treatments and environmental monitoring along the processing line. At the consumer level, cooking chicken properly and avoiding cross-contamination in the kitchen (cutting boards, utensils, surfaces) remain the most effective preventive measures.
Regulations and references
It is monitored by the CDC and the FDA in the United States, and by EFSA in the European Union, which consistently reports it as the most frequently notified zoonotic pathogen in the region, with local equivalents in other markets and a growing focus on reduction programs across the poultry chain.
Conclusion
According to CDC and EFSA figures, Campylobacter is the leading bacterial cause of foodborne illness worldwide, with the poultry industry as its main point of origin. Its microaerophilic nature makes it particularly demanding to detect by traditional culture, which has driven the adoption of molecular methods as a complement within monitoring programs.
About TAAG
Discover how TAAG's AiGOR™ molecular detection technology helps laboratories detect fastidious microorganisms such as Campylobacter without relying on the special culture conditions its growth requires.
Frequently asked questions
Does cooking chicken thoroughly eliminate the risk of Campylobacter?
Yes, proper cooking that reaches a sufficient internal temperature inactivates the bacterium. The greatest risk usually lies in cross-contamination during handling in the kitchen, not in chicken that is already well cooked.
Why is Campylobacter harder to culture than Salmonella?
Because it is microaerophilic and sensitive to normal atmospheric oxygen, which calls for controlled incubation atmospheres, higher temperatures and specific selective media, unlike bacteria that grow well under standard aerobic conditions.
What is the link between Campylobacter and Guillain-Barré syndrome?
In a small proportion of cases, Campylobacter infection can trigger this autoimmune disorder affecting the peripheral nerves weeks later, which makes it a priority pathogen for public health surveillance.