Foods That Cause Campylobacter jejuni Infection
Raw or undercooked poultry is the primary food source of Campylobacter jejuni infection, followed by unpasteurized milk, contaminated water, and raw shellfish. 1
Primary Food Sources
Poultry Products
Chicken meat represents the single most important transmission vehicle for C. jejuni infection. The bacteria colonize poultry intestines as commensals, leading to widespread contamination of meat during processing 2, 3. Poultry is safest when cooked to an internal temperature of 180°F, though absence of pink color does not always correlate with adequate internal temperature 4, 1.
- Raw or undercooked chicken and other poultry
- Cross-contamination from handling raw poultry to other foods, cutting boards, utensils, and hands 4, 1
- Barbecued meats where easy transfer occurs from raw to cooked products 5
Dairy Products
- Unpasteurized (raw) milk - a documented outbreak source 4, 1, 6
- Raw milk products including cheese and yogurt 7
- Fresh cheese made from unpasteurized milk (Campylobacter survives only briefly) 5
Other Animal Products
- Raw or undercooked meat (beef, pork) 1, 6
- Raw shellfish - particularly clams and other seafood 4, 1, 5
- Foods containing raw or undercooked eggs (hollandaise sauce, Caesar dressing, homemade mayonnaise, cookie/cake batter, eggnog) 4, 1
Water and Produce
- Contaminated water from lakes, rivers, or untreated sources 2, 3
- Unpasteurized fruit juice 4, 1
- Raw seed sprouts (alfalfa, mung bean) 4, 1
- Produce washed with contaminated water 1
Critical Prevention Measures
Food Handling
Cross-contamination during food preparation is a major transmission route. Uncooked meats must not contact other foods; hands, cutting boards, counters, knives and utensils require thorough washing after contact with raw foods 4, 1, 6.
High-Risk Populations
Children under 5 years, immunocompromised persons (including HIV-infected individuals with CD4+ counts <200 cells/µL), pregnant women, and elderly adults face increased risk of severe infection and should exercise heightened precautions 1, 7, 8.
Important Caveats
The infectious dose for C. jejuni is remarkably low - similar to E. coli O157 at <100 organisms - meaning even minimal contamination can cause infection 9. This low infectious dose explains why cross-contamination and inadequate cooking pose such significant risks.
Poultry remains contaminated despite appearing normal. Between 20-63% of retail chicken meat samples test positive for C. jejuni in surveillance studies 10, and the bacteria colonize healthy poultry without causing disease 2.
Antibiotic resistance is increasing in Campylobacter strains, with some studies showing 27% of strains resistant to multiple antibiotics 10, making prevention through proper food handling even more critical than treatment.