Contaminated eggs from Poland likely caused a Salmonella Enteritidis outbreak in France that sickened 16 people, according to the Direction Générale de l’Alimentation (DGAL). The outbreak affected patients aged 1 to 55, with four requiring hospitalization for fever and diarrhea, as reported by Santé publique France.
How did French authorities trace the Salmonella outbreak to Poland?
The DGAL identified the link after surveying patients and finding a connection between the onset of symptoms and the consumption of products containing raw eggs. Investigators used the codes printed on the eggshells to determine the origin of the product.
Because the white eggs were sold in supermarkets and consumed before the link was established, no product recall was issued. The DGAL stated it has contacted Polish authorities to ensure consumer safety measures are implemented.
What are the risks of large-scale Salmonella clusters in urban areas?
The risk of rapid spread is evident in a previous, larger outbreak in the Île-de-France region. In that instance, the National Reference Center (CNR) identified 103 Salmonella Enteritidis infections between August 2024 and January 2025. This event was described by the Île-de-France regional unit of Santé publique France as the largest ever reported in the region regarding case numbers, duration, and severity.
Data from that cluster shows a significant impact on young adults, with a median age of 23. Out of the patients interviewed, 25 were hospitalized and four required intensive care. The source of this larger outbreak was more complex than a single supermarket batch:
- Five patients were linked to three different restaurants.
- Four additional interviewed cases also ate egg-based products at those restaurants.
- 29 patients reported buying unbranded eggs in identical packaging from various locations.
The National Reference Laboratory (NRL) for Salmonella confirmed the genomic cluster by isolating the strain from mayonnaise sampled at one of the restaurants.
Why does sample storage time affect Salmonella detection?
Delays between collecting a sample and starting the incubation process can lead to false negatives. According to research published in the DGAL and ANSES epidemiological bulletin, storing fecal samples at room temperature (21°C / 69.8°F) for six hours can reduce Salmonella detection by up to 50%, particularly when contamination levels are low.
The study tested five Salmonella types: Enteritidis, Typhimurium, Virchow, Infantis, and Hadar. Researchers found that detection rates remained higher when holding times were limited to 45 minutes, 90 minutes, or four hours. To mitigate the risk of missing a detection, the researchers noted that storing samples at 4°C (39.2°F) reduces this negative effect.
Comparison of Detection Accuracy by Storage Time
| Storage Duration | Temperature | Detection Impact |
|---|---|---|
| 45 – 240 Minutes | 21°C (69.8°F) | Higher detection rates |
| 6 Hours | 21°C (69.8°F) | Up to 50% reduction in detection |
| 6 Hours | 4°C (39.2°F) | Reduced risk of detection loss |
Frequently Asked Questions
Which Salmonella strain was involved in the French outbreaks?
Both the recent outbreak linked to Polish eggs and the larger Île-de-France cluster involved Salmonella Enteritidis.
What are the typical symptoms of these infections?
According to Santé publique France, patients mainly experienced fever and diarrhea.
Why wasn’t there a recall for the Polish eggs?
The DGAL stated that the eggs had already been consumed by the time the link between the product and the symptoms was identified.
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