Raw eggs and Salmonella: who needs to be most careful

Most of what is written about egg safety answers one question: how to cook it. That matters, but it is not the only question. The other one — the one that actually decides how strict you need to be in the kitchen — is: who are you cooking for? Salmonella does not treat everyone the same. A healthy adult may have two bad days and forget the whole thing, while a child in their second year or a grandparent in their seventies may need hospital treatment from the same infection and the same egg. That gap is not a theoretical detail; it is the reason one household rule is not enough. What you are willing to eat yourself is not necessarily what you should serve to someone else.

What an infection actually looks like#

The World Health Organization describes non-typhoidal Salmonella infection as usually appearing 6 to 72 hours after eating contaminated food, most often within a 12-to-36-hour window. The typical symptoms are fever, abdominal pain, diarrhoea, nausea and sometimes vomiting, and in most people they last 2 to 7 days and resolve without drug treatment. That description is exactly why so many people shrug it off: an unpleasant stretch, then recovery.

But the same organisation warns that the dehydration caused by diarrhoea and vomiting can become severe and life-threatening, specifically in young children, the elderly and people with weakened immunity. The US Food and Drug Administration adds a sharper point: in these groups the infection may not stay in the intestines at all. It can move into the bloodstream and from there to other sites in the body — a situation that needs prompt antibiotic treatment. So the difference is not only in how bad the symptoms feel, but in the chance that a limited gut illness turns into a systemic one.

Who is most exposed#

The US health authorities, including the FDA and the Centers for Disease Control and Prevention, agree on four groups in whom the odds of severe illness and hospitalisation are higher:

• Children, especially under five: their immune system is still maturing, and dehydration reaches them faster because their bodies are small.
• Older adults, particularly over sixty-five, where the immune response weakens and chronic conditions stack up to make any infection heavier.
• Pregnant women, since immune function shifts during pregnancy, and any illness bringing fever and dehydration becomes a concern for mother and baby alike.
• People with weakened immunity — the FDA names transplant patients, people living with HIV/AIDS, cancer patients and people with diabetes.

Notice that diabetes is on the list, which surprises many people. The point is that weakened immunity is not always a rare or visible condition — it may be your neighbour or the guest at your table, and they have no reason to mention it. So the practical rule when cooking for a group whose health you do not know in detail, such as a family gathering, is to assume at least one person from these groups is present.

The simplest household rule: a runny yolk is a personal decision a healthy adult makes for themselves, while anything served to children, pregnant women, older adults or people with chronic illness is cooked until both yolk and white are fully set — no exceptions, and no awkwardness in asking before you serve.

Where raw egg hides#

The common mistake is not deliberately eating a raw egg — few people do that. It is the dishes where the egg stays raw or barely cooked without anyone noticing, and most of them are much-loved sauces and desserts:

• Home-made mayonnaise and the dressings built on it, including the Caesar dressing the FDA names explicitly.
• Cold desserts that never see an oven: mousse, tiramisu, filling creams, uncooked meringue and home-made ice cream.
• Tasting batter and dough during preparation — an entrenched kitchen habit, and especially a children's one around the cake bowl.
• Blended drinks with a raw egg added for extra protein.
• Emulsified sauces that rely on yolk which never reaches a sufficient temperature.
• Dishes that look cooked but whose centre did not get there: custards, pastry fillings and thick baked egg trays.

The practical upshot is that the right question about any dish is not whether it was cooked, but whether the egg inside it got hot enough. The FDA recommends that egg-containing dishes reach 160°F, about 71°C, measured with a food thermometer rather than by eye — because a cooked-looking surface can hide a centre that has not heated at all.

Pasteurised eggs: when they are the answer#

Some recipes cannot have their egg cooked at all, because cooking ruins them. Ordinary advice is useless here, and the only recognised solution is to swap ordinary eggs for heat-treated ones. The FDA's recommendation is that recipes serving egg raw or undercooked — Caesar dressing, home-made ice cream — use either shell eggs treated to destroy Salmonella by pasteurisation or another approved method, or ready-made pasteurised egg products.

In-shell pasteurisation means heating the egg to a temperature that kills bacteria without cooking its contents, so it comes out looking and behaving like an ordinary raw egg while being safe to use raw. The FDA notes that such eggs can be found in the chilled section of some stores. The mistake people make here is treating freshness as a substitute for pasteurisation. It is not: Salmonella can be inside the egg from the moment it forms in the hen, and an egg laid yesterday can carry it exactly as an older one can.

And why the advice differs between countries#

You may come across English articles saying that pregnant women can eat eggs with a runny yolk. That is not a falsehood, but it is bound to its context: the UK Food Standards Agency revised its guidance in 2017, following a 2016 report by the Advisory Committee on the Microbiological Safety of Food which concluded that the Salmonella risk in British eggs had fallen substantially — specifically in eggs produced under the British Lion scheme, which includes flock vaccination and traceability. And the exception is tied to that mark: eggs without it remain, under the same guidance, eggs that should be well cooked.

In other words, that exception is not a verdict on eggs everywhere, but on eggs covered by a specific assurance scheme in a specific country. General guidance in Saudi Arabia follows the more conservative line: the Saudi Food and Drug Authority points out that Salmonella risks begin in your own kitchen, and advises cooking poultry thoroughly and avoiding raw eggs and unpasteurised milk. That is the advice to follow unless the pack in your hand explicitly states that the eggs are pasteurised.

House rules when someone at the table is vulnerable#

1. Buy eggs chilled and refrigerate them immediately at no more than 4°C — the 40°F the FDA specifies.
2. Keep a pack of pasteurised eggs in the fridge if the household includes a young child, a pregnant woman or anyone on immune-suppressing treatment, and use it for everything that will not be cooked.
3. Cook anything served to these groups until yolk and white are set, and use a thermometer on thick dishes, targeting 71°C.
4. Ban tasting raw batter and dough — the easiest rule to enforce with children, because it needs no more explanation than: we wait until it is done.
5. Never leave eggs or cooked egg dishes out of refrigeration for more than two hours, or one hour when it is hotter than 32°C, which is most of the year in Riyadh.
6. Wash your hands, tools and the surface after cracking eggs and before touching any ready-to-eat food, since the shell itself may be contaminated on the outside.

If your work means feeding a vulnerable group#

All of the above multiplies in kitchens serving nurseries, care homes, hospitals and clinical nutrition services, because there every meal goes to someone in one of those four groups by definition rather than by chance. The operating rule is clear: no menu item contains raw or undercooked egg unless it comes from pasteurised egg documented on the supplier's invoice, recorded in the food-safety records. The US Food Safety and Inspection Service goes further, noting that pasteurised egg products are best used in a cooked product, especially when served to high-risk people such as infants, young children, pregnant women, older adults and people with weakened immune systems — a sensible extra margin in these settings.

When to seek medical advice#

Most cases resolve on their own within two to seven days, as the WHO notes, and the core care is replacing fluids. But the threshold drops sharply for the four groups: if a child under five, a person over sixty-five, a pregnant woman or someone with weakened immunity develops diarrhoea and fever after a suspect meal, it is better to seek medical advice early rather than wait. And for anyone, signs such as high fever, blood in the stool, inability to keep fluids down, clear dehydration such as passing little urine or feeling dizzy, or symptoms lasting more than three days without improvement, are all reasons to seek care rather than wait it out.

If someone vulnerable eats a dish with raw egg by accident, there is no need for panic or pre-emptive treatment: contamination is a possibility, not a certainty. What is needed is attention to symptoms over the next three days, fluid replacement at the first sign of diarrhoea, and early medical advice if a fever appears.

The lesson comes down to this: egg safety is relative, not absolute. The same egg and the same dish carry two different levels of risk depending on who is going to eat them. So the most useful question to ask before serving anything with undercooked egg is not where the eggs came from or what date is on the box, but who is sitting at the table. If a young child, a pregnant woman, an older adult or someone with weakened immunity is among them, the answer is already decided: cook it until set, or make it with pasteurised egg.