A salmonella outbreak linked to imported eggs has infected 207 people across the UK, resulting in one death and 34 hospitalisations, according to the UK Health Security Agency.
What is Salmonella and How Does it Spread?
Salmonella is not a single bug, but rather a whole group of bacteria containing over 2,500 different types that can cause infection in humans, according to Dr Malick Gibani, a clinical associate professor at Imperial College London. Most disease in the UK is caused by just a few of those types, typically found in contaminated animal products like meat, dairy, and eggs. However, past UK outbreaks have also centered on chocolate, peanut butter, and cucumbers. The bacteria can spread through contaminated drinking water, contact with animals, person-to-person contact, or poor food hygiene, particularly when cooked food touches raw or undercooked items, Gibani noted.
Symptoms and Health Impact of Food Poisoning
Salmonella causes gastroenteritis, an infection of the gut that leads to food poisoning with symptoms appearing within a few hours to a few days. Affected individuals typically experience abdominal pain, diarrhoea, vomiting, and a fever, alongside potential fatigue and sore muscles and joints. Gibani stated that while the infection is unpleasant for a few days and usually resolves without treatment, vulnerable groups may require antibiotics if a severe bloodstream infection develops, though such cases are rare in healthy UK adults.
Who is Most at Risk for Severe Illness?
Children, older adults, individuals with suppressed immune systems—such as cancer patients taking chemotherapy drugs—and people with underlying health conditions face a higher risk of severe illness. Gibani explained that the bacteria can occasionally spread beyond the gut and into the blood, triggering a dangerous sepsis-like illness. Globally, severe and invasive cases kill thousands of people annually, with high rates of bloodstream infections notably reported in parts of sub-Saharan Africa among children who are malnourished, have untreated HIV, or have recently had malaria.
Did you know? While eggs are a common vehicle, salmonella outbreaks in the UK have previously been linked to non-animal products such as chocolate, peanut butter, and cucumbers, according to health experts.
Egg Safety and Consumer Guidance
Experts emphasize that consumers do not need to avoid eggs entirely, but should exercise care when purchasing and preparing them. Kimberly Coffin, the technical director of supply chain assurance at LRQA, a global risk management firm based in Birmingham, advises buying eggs produced in the UK that carry the red lion mark, which indicates they come from hens vaccinated against salmonella. Coffin recommends cooking eggs and egg dishes until both the yolk and white are firm, or to a temperature of 71C. Consumers should avoid cracked, broken, or visibly dirty eggs, as washing them does not reduce the risk and increases it.
Pro Tip: Never wash dirty eggs before use. According to food safety experts, washing dirty eggs does not reduce this risk and, in fact, increases the risk due to the potential for ingress of potential microbiological contaminates on the surface into the egg.
Public Concern and Existing Protections
While public concern is understandable following the current outbreak, experts stress that the UK maintains robust systems of protection, including vaccination programs and strong food standards and controls, especially for eggs, established after previous outbreaks. However, Gibani and Coffin noted that no regime is failsafe. Gibani advises that the public should be aware and informed but not alarmed, utilizing resources like the UKHSA website for further guidance.
Frequently Asked Questions
What are the main symptoms of salmonella infection?
Symptoms include abdominal pain, diarrhoea, vomiting, and a fever, which typically appear within a few hours to a few days.
Are UK-produced eggs safe to eat?
Yes. According to Kimberly Coffin, the safest choice for consumers is to buy eggs produced in the UK which carry the red lion mark, as these come from hens that have been vaccinated against salmonella.
Should I wash eggs before cooking them?
No. Washing dirty eggs before use does not reduce this risk and, in fact, increases the risk.
Take Action: Have you altered your food purchasing habits following recent food safety reports? Share your thoughts in the comments below, or subscribe to our newsletter for the latest public health updates.
Related reading